Ray Optics PYQs Set 11 (PDF)

Set 11 of 16 · Questions 301-330 of 467

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher · Previous Year Questions NEET Physics · Ray Optics · Set 11 (Q301-330)
Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.
301. $A ray of light is travelling from glass to air. (Refractive index of glass ). The angle of incidence is . The deviation of the ray is$ (1) $0^{\circ}$ (2) $80^{\circ}$ (3) $50^{\circ} - sin^{- 1} (\frac{sin 50 ^{\circ}}{1.5})$ (4) $sin^{- 1} (\frac{sin 50 ^{\circ}}{1.5}) - 50^{\circ}$ 302. $An image is formed at a distance of from the glass surface when light from point source in air falls on a spherical glass surface with refractive index 1.5. The distance of the light source from the glass surface is . The radius of curvature is$ (1) $20 cm$ (2) $40 cm$ (3) $30 cm$ (4) $50 cm$ 303. $A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. Iflenses are made of different materials of refractive indices and and is the radius of curvature ofthe curved surface ofthe lenses, then the focal length of the combination is$ (1) $\frac{R}{( μ _{1} - μ _{2} )}$ (2) $\frac{2 R}{( μ _{2} - μ _{1} )}$ (3) $\frac{R}{2 ( μ _{1} + μ _{2} )}$ (4) $\frac{R}{2 ( μ _{1} - μ _{2} )} .$ 304. $Region I and II are separated by a spherical surface of radius 25cm. An object is kept in region I at a distance of 40cm from the surface. The distance of the image from the surface is :$ (1) $55.44cm$ (2) $9.52cm$ (3) $18.23cm$ (4) $37.58cm$ 305. $Consider a point object situated at a distance of from the centre of sphere of radius and refractive index 1.5 as shown in the figure. If the refractive index of the region surrounding this sphere is 1.4 , then the position of the image due to refraction by sphere with respect to the centre is$ (1) $30 cm$ (2) $45 cm$ (3) $\infty$ (4) $28 cm$ 306. $A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distance d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the distance d (in cm) will be [NEET 2021]$ (1) $25$ (2) $15$ (3) $50$ (4) $30$ 307. $Light travels in two media M_{1} and M_{2} with speeds 1.5 x 1 0^{8} m s^{- 1} and 2.0 x 1 0^{8} m s^{- 1} respectively. The critical angle between them is:$ (1) $tan^{- 1} (\frac{3}{7})$ (2) $tan^{- 1} (\frac{2}{3})$ (3) $cos^{- 1} (\frac{3}{4})$ (4) $sin^{- 1} (\frac{2}{3})$ 308. $A transparent block A having refractive index is surrounded by another medium of refractive index as shown in the figure. A light ray is incident on the flat face of the block with incident angle as shown in the figure. What is the maximum value of for which light suffers total internal reflection at the top surface of the block?$ (1) $tan^{- 1} (4/3)$ (2) $sin^{- 1} (3/4)$ (3) $tan^{- 1} (3/4)$ (4) $cos^{- 1} (3/4)$ 309. $Two similar thin equi-convex lenses, of focal length f each, are kept co-axially in contact with each other such that the focal length of the combination is . When the space between the two lenses is filled with glycerine (which has the same refractive index ( ) as that of glass) then the equivalent focal length is . The ratio will be [NEET 2019]$ (1) $1 : 2$ (2) $2 : 3$ (3) $3 : 4$ (4) $2 : 1$ 310. $A ray of light is incident on a prism of prism angle 60º at the minimum deviation position. The angle of refraction at the first face (i.e., incident face) of the prism is$ (1) $zero$ (2) $30°$ (3) $45°$ (4) $60°$ 311. $A slanted object AB is placed on one side of convex lens as shown in the diagram. The image is formed on the opposite side. Angle made by the image with principal axis is:$ (1) $- α$ (2) $- α 2$ (3) $- 45^{\circ}$ (4) $+ 45^{\circ}$ 312. $A 2 meter long scale with least count of 0. 2 cm is used to measure the locations of objects on an optical bench. While measuring the focal length of a convex lens, the object pin and the convex lens are placed at 80 cm mark and 1 m mark, respectively. The image of the object pin on the other side of lens coincides with image pin that is kept at 180 cm mark. The % error in the estimation of focal length is:$ (1) $0.85$ (2) $1.70$ (3) $1.02$ (4) $0.51$ 313. $In young’s double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduced to half. As a result the fringe width$ (1) $is halved$ (2) $becomes four times$ (3) $remains unchanged$ (4) $is doubled.$ 314. $One plano-convex and one plano-concave lens of same radius of curvature but of different materials are joined side by side as shown in the figure. If the refractive index of the material of is and that of is then the focal length of the combination is:$ (1) $\frac{R}{μ _{1} - μ _{2}}$ (2) $\frac{2 R}{μ _{1} - μ _{2}}$ (3) $\frac{2 R}{2 ( μ _{1} - μ _{2} )}$ (4) $\frac{R}{2 - ( μ _{1} - μ _{2} )}$ 315. $Diameter of a plano - convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 \times 108 m/s, the focal length of the lens is :$ (1) $15 cm$ (2) $20 cm$ (3) $30 cm$ (4) $10 cm$ 316. $A thin Plano convex lens made of glass of refractive index 1.5 is immersed in a liquid ofrefractive index 1.2. When the plane side of the lens is silver coated for complete reflection, the lens immersed in the liquid behaves like a concave mirror of focal length 0.2 m. The radius of curvature of the curved surface of the lens is$ (1) $0.20 m$ (2) $0.25 m$ (3) $0.15 m$ (4) $0.10 m$ 317. $A ray of light from a denser medium strikes a rare medium as shown in figure. The reflected andrefracted rays make an angle of with each other. The angles of reflection and refraction are and The critical angle would be$ (1) $s i n_{(}^{- ⊥} t an r_{)}$ (2) $s i n_{(}^{- 1} s in r_{)}$ (3) $co s_{(}^{- 1} t an r_{)}$ (4) $t a n_{(}^{- 1} s in r_{)}$ 318. $A lens having focal length f and aperture of diameter d forms an image of intensity I . Aperture of diameter \frac{d}{2} in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively$ (1) $f and \frac{I}{4}$ (2) $\frac{3 f}{4} and \frac{I}{2}$ (3) $f and \frac{3 I}{4}$ (4) $\frac{f}{2} and \frac{I}{2} .$ 319. $An object is placed infront of a spherical concave mirror between the focal point and the radius of curvature. Its image is$ (1) $inverted, real, further than radius of curvature from mirror$ (2) $inverted, virtual, closer than focal point to mirror$ (3) $upright, real, further than radius of curvature from mirror$ (4) $inverted, real, closer than radius of curvature to mirror$ 320. $A fish in water (refractive index ) looks at a bird vertically above in the air. If is the height of the bird and is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is$ (1) $x + y (1 + \frac{1}{n})$ (2) $y + x (1 - \frac{1}{n})$ (3) $x + y (1 - \frac{1}{n})$ (4) $x + ny$ 321. $To a fish under water, viewing obliquely a fisherman standing on the bank of a lake, the man looks$ (1) $taller than what he actually is$ (2) $shorter than what he actually is$ (3) $the same height as he actually is$ (4) $depends on the obliquity.$ 322. $A person has been using spectacles of power-1.0 diopter for distant vision and a separate reading glass of power 2.0 diopters. What is the least distance of distinct vision for this person:$ (1) $10 cm$ (2) $40 cm$ (3) $30 cm$ (4) $50 cm$ 323. $Two concave refracting surfaces of equal radii of curvature and refractive index 1.5 face each other in air as shown in figure. A point object O is placed midway, between P and B. The separation between the images of , formed by each refracting surface is:$ (1) $0.214 R$ (2) $0.411 R$ (3) $0.124 R$ (4) $0.114 R$ 324. $A convex lens is put from a light source and it makes a sharp image on a screen, kept from the lens. Now a glass block (refractive index ) of thickness is placed in contact with the light source. To get the sharp image again, the screem is shifted by a distance . Then is:$ (1) $1.1 cm away from the lens$ (2) $0$ (3) $0.55 cm towards the lens$ (4) $0.55 cm away from the lens$ 325. $Two point sources S_{1} and S_{2} are 24 cm apart. Where should a convex lens of focal length 9 cm be placed in between them, so that the images of both sources are formed at the same place?$ (1) $8 cm$ (2) $6 cm$ (3) $12 cm$ (4) $10 cm$ 326. $A car is fitted with a convex side-view mirror of focal length 20 cm. A second car 2.8 m behind the first car is overtaking the first car at a relative speed of 15 m/s. The speed of the image of the second car as seen in the mirror of the first one is :$ (1) $\frac{1}{10} m/s$ (2) $\frac{1}{15} m/s$ (3) $10 m/s$ (4) $15 m/s$ 327. $A ray of light is incident at an angle of incidence , on one face ofa prism ofangle (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is , the angle of incidence , is nearly equal to$ (1) $μ A$ (2) $\frac{μ A}{2}$ (3) $\frac{A}{μ}$ (4) $\frac{A}{2 μ}$ 328. $The incident ray, reflected ray and the outward drawn normal are denoted by the unit vectors a, b and c respectively. Then choose the correct relation for these vectors.$ (1) $b = 2 a + c$ (2) $b = a - c$ (3) $b = a + 2 c$ (4) $b = a - 2 (a \cdot c) c$ 329. $A biconvex lens is formed by using two thin planoconvex lenses, as shown in the figure. The refractive index and radius of curved surfaces are also mentioned in figure. When an object is placed on the left side of lens at a distance of 30 cm from the biconvex lens, the magnification of the image will be :$ (1) $-2$ (2) $+2.5$ (3) $-2.5$ (4) $+2$ 330. $If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :$ (1) $15 cm$ (2) $- 12 cm$ (3) $- 10 cm$ (4) $10/3 cm$