Ray Optics PYQs Set 16 (PDF)

Set 16 of 16 · Questions 451-467 of 467

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Mere Teacher · Previous Year Questions NEET Physics · Ray Optics · Set 16 (Q451-467)
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451. $The graph between angle of deviation (δ) and angle of incidence (i) for a triangular prism is represented by :$ (1) (2) (3) (4) 452. $A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figure). Choose the incorrect option for the reported pieces.$ (1) $Power of L_{1} = \frac{P}{2}$ (2) $Power of L_{2} = \frac{P}{2}$ (3) $Power of L_{3} = \frac{P}{2}$ (4) $Power of L_{1} = P$ 453. $In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact, what will be angle of refraction?$ (1) $90º$ (2) $180º$ (3) $0º$ (4) $equal to angle of incidence$ 454. $Light enters at an angle of incidence in a transparent rod of refractive index . For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateralface whatsoever be the value of angle of incidence7.$ (1) $n = 1.1$ (2) $n = 1$ (3) $n > 2$ (4) $n = 1.3$ 455. $As shown in the figure, after passing through the medium 1. The speed of light v_{2} in medium 2 will be: (Given c = 3x 1 0^{8} m s^{- 1})$ (1) $1.0 x 1 0^{8} m s^{- 1}$ (2) $0.5 x 1 0^{8} m s^{- 1}$ (3) $1.5 x 1 0^{8} m s^{- 1}$ (4) $3.0 x 1 0^{8} m s^{- 1}$ 456. $A concave mirror of focal length f_{1} is placed at a distance of d from a convex lens of focal length f_{2} . A beam of light coming from infinity and falling on this convexlens‐concave mirror combination returns to infinity The distance d must equal$ (1) $f_{1} + f_{2}$ (2) $- f_{1} + f_{2}$ (3) $2 f_{1} + f_{2}$ (4) $- 2 f_{1} + f_{2} .$ 457. $The refracting angle of a prism is , and refractive index of the material of theprism is . The angle of minimum deviation is$ (1) $9 0^{o} - A$ (2) $18 0^{0} + 2 A$ (3) $18 0^{0} - 3 A$ (4) $18 0^{0} - 2 A .$ 458. $A beaker contains water up to a height h1 and kerosene of height h2 above water so that the total height of (water + kerosene) is (h1 + h2). Refractive index of water is μ1 and that of kerosene is μ2. The apparent shift in the position of the bottom of the beaker when viewed from above is :$ (1) $(1 + \frac{1}{μ _{1}}) h_{1} - (1 + \frac{1}{μ _{2}}) h_{2}$ (2) $(1 - \frac{1}{μ _{1}}) h_{1} + (1 - \frac{1}{μ _{2}}) h_{2}$ (3) $(1 + \frac{1}{μ _{1}}) h_{2} - (1 + \frac{1}{μ _{2}}) h_{1}$ (4) $(1 - \frac{1}{μ _{1}}) h_{2} + (1 - \frac{1}{μ _{2}}) h_{1}$ 459. $Curved surfaces of a plano-convex lens of refractive index and a plano-concave lens of refractive index have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.$ (1) $\frac{1}{μ _{2} - μ _{1}}$ (2) $μ_{1} - μ_{2}$ (3) $\frac{1}{μ _{1} - μ _{2}}$ (4) $μ_{2} - μ_{1}$ 460. $Substance on the choroid is$ (1) $Japan black$ (2) $Nigrim pigment$ (3) $Carbon black$ (4) $Platinum black$ 461. $Near and far points of a human eye are$ (1) $0 and 25 cm$ (2) $0 and \infty$ (3) $25 cm and 100 cm$ (4) $25 cm and \infty$ 462. $The hyper-metropia is a$ (1) $Short-side defect$ (2) $Long- side defect$ (3) $Bad vision due to old age$ (4) $None of these$ 463. $The human eye has a lens which has a$ (1) $Soft portion at its centre$ (2) $Hard surface$ (3) $Varying refractive index$ (4) $Constant refractive index$ 464. $The interference pattern is obtained with two coherent light sources of intensity ratio n . In the interference pattern, the ratio \frac{I _{m a x} - I _{m i n}}{I _{m a x} + I _{m i n}} will be$ (1) $\frac{n}{n + 1}$ (2) $\frac{2 n}{n + 1}$ (3) $\frac{n}{( n + 1 ) ^{2}}$ (4) $\frac{2 n}{( n + 1 ) ^{2}}$ 465. $In Young's double slit experiment carried out with light of wavelength (λ) = 5000 A ˚, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0 . The third maximum (taking the central maximum as zeroth maximum) will be at x equal to$ (1) $1.67 cm$ (2) $1.5 cm$ (3) $0.5 cm$ (4) $5.0 cm.$ 466. $A point object is kept at a distance of . The radius of curvature of the spherical surface is . The refractive index of the media are and which are as shown in the diagram. Then,(1) if , image is virtual for all values of u.(2) if , image is virtual when .(3) the image is real for all values of and .Here, the correct statement/s is/are$ (1) $only (2)$ (2) $both (1) and (2)$ (3) $only (1)$ (4) $(1), (2) and (3)$ 467. $Optical fibre are based on$ (1) $total internal reflection$ (2) $less scattering$