Ray Optics PYQs Set 18 (PDF)

Set 18 of 18 · Questions 511-521 of 521

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Mere Teacher · Previous Year Questions JEE Main Physics · Ray Optics · Set 18 (Q511-521)
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511. $The refracting angle of a prism is , and refractive index of the material of theprism is . The angle of minimum deviation is$ (1) $9 0^{o} - A$ (2) $18 0^{0} + 2 A$ (3) $18 0^{0} - 3 A$ (4) $18 0^{0} - 2 A .$ 512. $A beaker contains water up to a height h1 and kerosene of height h2 above water so that the total height of (water + kerosene) is (h1 + h2). Refractive index of water is μ1 and that of kerosene is μ2. The apparent shift in the position of the bottom of the beaker when viewed from above is :$ (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) $(1 - \frac{1}{μ _{1}}) h_{2} + (1 - \frac{1}{μ _{2}}) h_{1}$ 513. $Curved surfaces of a plano-convex lens of refractive index and a plano-concave lens of refractive index have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses.$ (1) $\frac{1}{μ _{2} - μ _{1}}$ (2) $μ_{1} - μ_{2}$ (3) $\frac{1}{μ _{1} - μ _{2}}$ (4) $μ_{2} - μ_{1}$ 514. $Substance on the choroid is$ (1) $Japan black$ (2) $Nigrim pigment$ (3) $Carbon black$ (4) $Platinum black$ 515. $Near and far points of a human eye are$ (1) $0 and 25 cm$ (2) $0 and \infty$ (3) $25 cm and 100 cm$ (4) $25 cm and \infty$ 516. $The hyper-metropia is a$ (1) $Short-side defect$ (2) $Long- side defect$ (3) $Bad vision due to old age$ (4) $None of these$ 517. $The human eye has a lens which has a$ (1) $Soft portion at its centre$ (2) $Hard surface$ (3) $Varying refractive index$ (4) $Constant refractive index$ 518. $The interference pattern is obtained with two coherent light sources of intensity ratio n . In the interference pattern, the ratio \frac{I _{m a x} - I _{m i n}}{I _{m a x} + I _{m i n}} will be$ (1) $\frac{n}{n + 1}$ (2) $\frac{2 n}{n + 1}$ (3) $\frac{n}{( n + 1 ) ^{2}}$ (4) $\frac{2 n}{( n + 1 ) ^{2}}$ 519. $In Young's double slit experiment carried out with light of wavelength (λ) = 5000 A ˚, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0 . The third maximum (taking the central maximum as zeroth maximum) will be at x equal to$ (1) $1.67 cm$ (2) $1.5 cm$ (3) $0.5 cm$ (4) $5.0 cm.$ 520. $A point object is kept at a distance of . The radius of curvature of the spherical surface is . The refractive index of the media are and which are as shown in the diagram. Then,(1) if , image is virtual for all values of u.(2) if , image is virtual when .(3) the image is real for all values of and .Here, the correct statement/s is/are$ (1) $only (2)$ (2) $both (1) and (2)$ (3) $only (1)$ (4) $(1), (2) and (3)$ 521. $Optical fibre are based on$ (1) $total internal reflection$ (2) $less scattering$