Ray Optics PYQs Set 8 (PDF)

Set 8 of 16 · Questions 211-240 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Ray Optics · Set 8 (Q211-240)
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211. $Two identical glass (μ_{g} = 3 / 2) equi-convex lenses of focal length f each are kept in contact. The space between the two lenses is filled with water (μ_{w} = 4/3). The focal length of the combination is [NEET 2016]$ (1) $f/3$ (2) $f$ (3) $\frac{4 f}{3}$ (4) $\frac{3 f}{4}$ 212. $An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film ?$ (1) $7.2 m$ (2) $2.4 m$ (3) $3.2 m$ (4) $5.6 m$ 213. $A ray of light entering from air into a denser medium of refractive index , as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle should be equal to :$ (1) $sin^{- 1} \frac{7}{3}$ (2) $sin^{- 1} \frac{5}{4}$ (3) $sin^{- 1} \frac{7}{4}$ (4) $sin^{- 1} \frac{5}{3}$ 214. $A convex lens focusses an object from it on a screen placed away from it. A glass plate (refractive index ) of thickness is inserted between the lens and the screen. What is the distance of the object from the lens, so that its image is again focused on the screen?$ (1) $22.5 cm$ (2) $30.7 cm$ (3) $25.0 cm$ (4) $28.4 cm$ 215. $A concave mirror has radius of curvature of It isat the bottom of a glass that has water filled up to (see figure). If a small partricle is floating on the surface of water, its image as seen, from directly above the glass, is at a distance from the surface of water. The value of isclose to:(Refractive index of water )$ (1) $6.7 cm$ (2) $13.4 cm$ (3) $8.8 cm$ (4) $11.7 cm$ 216. $The position of the image formed by the combination of lenses is :$ (1) $15 cm (right of second lens)$ (2) $30 cm (left of third lens)$ (3) $15 cm (left of second lens)$ (4) $30 cm (right of third lens)$ 217. $A bioconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens ?(Refractive index of lens material = 1.5)$ (1) $Virtual, upright, height = 1 cm$ (2) $Virtual, upright, height = 0.5 cm$ (3) $Real, inverted, height = 4 cm$ (4) $Real, inverted, height = 1cm$ 218. $Two similar thin equi-convex lenses, of focal f each, are kept coaxially in contact with each other such that the focal length of the combination is . When the space between the two lens is filled with glycerin (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is . The ratio : will be$ (1) $3 : 4$ (2) $2 : 1$ (3) $1 : 2$ (4) $2 : 3$ 219. $A light ray enters through a right angled prism at point P with the angle of incidence as shown in figure. It travels through the prism parallel to its base BC and emerges along the face AC. The refractive index of the prism is [NEET 2024]$ (1) $\frac{5}{4}$ (2) $\frac{5}{2}$ (3) $\frac{3}{4}$ (4) $\frac{3}{2}$ 220. $In figure, the optical fiber is long andhas a diameter of . If a ray of lightis incident on one end of the fiber at angle the number of reflections it makes beforemergingfrom the other end is close to:(refractive index of fiber is and$ (1) $55000$ (2) $66000$ (3) $45000$ (4) $57000$ 221. $A concave mirror produces an image of an object such that the distance between the object and image is 20 cm. If the magnification of the image is ' -3 ', then the magnitude of the radius of curvature of the mirror is:$ (1) $30 cm$ (2) $3.75 cm$ (3) $15 cm$ (4) $7.5 cm$ 222. $The power of a lens (biconvex) is 1.25 in particular medium. Refractive index of the lens is 1.5 and radii of curvature are 20 cm and 40 cm respectively. The refractive index of surrounding medium :$ (1) $1.0$ (2) $\frac{9}{7}$ (3) $\frac{3}{2}$ (4) $\frac{4}{3}$ 223. $A ray of light is incident on a prism at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is$ (1) $zero$ (2) $30^{\circ}$ (3) $45^{\circ}$ (4) $60^{\circ}$ 224. $A spherical surface of radius of curvature , separates air from glass (refractive index ). The centre of curvature is in the glass medium. A point object ' ' placed in air on the optic axis of the surface, so that its real image is formed at ' ' inside glass. The line OI intersects the spherical surface at P and . The distance PO equals to$ (1) $5 R$ (2) $3 R$ (3) $1.5 R$ (4) $2 R$ 225. $The angle of incidence for a ray of light at a refracting surface of a prism is . The angle of prism is . If the ray suffers minimum deviation through the prism. the angle of ininimum deviation and refractive index of the material of the prism respectively, are [NEET 2016]$ (1) $30^{\circ} : 2$ (2) $45^{\circ}; 2$ (3) $30^{\circ}; \frac{1}{2}$ (4) $45^{\circ}; \frac{1}{2}$ 226. $In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction? [NEET 2019]$ (1) $0^{\circ}$ (2) $Equal to angle of incidence$ (3) $90^{\circ}$ (4) $180^{\circ}$ 227. $An object O is placed at 7 cm to the left of a concave mirror of radius of curvature 12 cm as shown in the figure. The position of the image will be at a distance of$ (1) $20 cm from the mirror to the left.$ (2) $30 cm from the mirror to the right.$ (3) $42 cm from the mirror to the left.$ (4) $42 cm from the mirror to the right.$ 228. $A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?$ (1) $2.4 \times 1 0^{8} m / s$ (2) $3.0 \times 1 0^{8} m / s$ (3) $1.2 \times 1 0^{8} m / s$ (4) $1.8 \times 1 0^{8} m / s .$ 229. $A small source of light is 4 below the surface of water of refractive index 5/3. In order to cut off all the light, coming out of water surface, minimum diameter of the disc placed on the surface ofwater is$ (1) $6 m$ (2) $\infty$ (3) $3 m$ (4) $4 m .$ 230. $A symmetric thin biconvex lens is cut into four equal parts by two planes AB and CD as shown in figure. If the power of original lens is 4 D then the power of a part of the divided lens is$ (1) $D$ (2) $8 D$ (3) $2 D$ (4) $4 D$ 231. $An object is placed at a distance of 12 cm in front of a plane mirror. The virtual and erect image is formed by the mirror. Now the mirror is moved by 4 cm towards the stationary object. The distance by which the position of image would be shifted, will be$ (1) $4 cm towards mirror$ (2) $8 cm towards mirror$ (3) $8 cm away from mirror$ (4) $2 cm towards mirror$ 232. $A transparent cube of 0.21 m edge contains a small air bubble. Its apparent distance when viewed through one face of the cube is 0.10 m and when viewed from the opposite face is 0.04 m . The actual distance of the bubble from the second face of the cube is$ (1) $0.06 m$ (2) $0.17 m$ (3) $0.05 m$ (4) $0.04 m$ 233. $A beam of light consisting of red, green and blue colours is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47, respectively. The prism will:$ (1) $separate all the three colours from one another$ (2) $not separate the three colours at all$ (3) $separate the red colour part from the green and blue colours$ (4) $separate the blue coloure part from the red and green colours$ 234. $A green light is incident from the water to the air - water interface at the critical angle (θ). Select the correct statement.$ (1) $The entire spectrum of visible light will come out of the water at an angle of 90º to the normal.$ (2) $The spectrum of visible light whose frequency is less than that of green light will come out ot the air medium.$ (3) $The spectrum of visible light whose frequency is more than that of green light will come out to the air medium.$ (4) $The entire spectrum of visible light will come out of the water at various angles to the normal.$ 235. $The difference of speed of light in the two media A and B ( – ) is 2.6 x m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given : speed of light in vacuum c = 3 x )$ (1) $1.303$ (2) $1.318$ (3) $1.13$ (4) $0.12$ 236. $Two similar thin equiconvex lenses, of focal length each, are kept coaxially in contact with each other such that the focal length of the combination is . When the space between the two lenses is filled with glycerin (which has the same refractive index as that of glass) then the equivalent focal length is . The ratio will be$ (1) $3: 4$ (2) $2: 1$ (3) $1 : 2$ (4) $2: 3.$ 237. $A light wave travelling linearly in a medium of dielectric constant 4, incident on the horizontal interface separating medium with air. The angle of incidence for which the total intensity of incident wave will be reflected back into the same medium will be (Given : relative permeability of medium μ_{r} = 1)$ (1) $10°$ (2) $20°$ (3) $30°$ (4) $60°$ 238. $The focal length of converging lens is measured for violet, green and red colours. It is respectively f_{v}, f_{g}, f_{r} . We will get$ (1) $f_{v} < f_{r}$ (2) $f_{g} > f_{r}$ (3) $f_{v} = f_{g}$ (4) $f_{g} < f_{r} .$ 239. $Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm, at same distance of 18 cm from the respective mirrors. The ratio of sizes of the images formed by convex mirror and by concave mirror is:$ (1) $2$ (2) $1/2$ (3) $1/3$ (4) $3$ 240. $A thin prism of angle made of glass of refractive index is combined with another prism of glass of refractive index . The combination of the prisms produces dispersion without deviation. The angle of the second prism should be$ (1) $5^{o}$ (2) $7^{o}$ (3) $1 0^{o}$ (4) $1 2^{o}$