MHT CET 2021 23th September Morning Shift | Ray Optics Question 72 | Physics

A ray of light travels from air to water to glass and again from glass to air. Refractive index of water w.r.t. air is 'X', glass w.r.t. water is 'Y' and air w.r.t. glass is 'Z'. Which one of the following is correct?

YZ = X

XYZ = 1

XY = Z

XZ = Y

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

-0

An object is located on a wall, its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance '$$\mathrm{d}$$' in front of the second wall. The required focal length of the lens is

less than $$\frac{d}{4}$$

only $$\frac{\mathrm{d}}{4}$$

(more than $$\frac{d}{4}$$ but less than $$\frac{d}{2}$$

only $$\frac{d}{2}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

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The critical angle for light going from medium '$$x$$' to medium '$$Y$$' is $$\theta$$. The speed of light in medium '$$x$$' is '$$V$$' . The speed of light in medium '$$Y$$' is

$$\mathrm{V}_{\mathrm{x}} \sin \theta$$

$$\mathrm{V}_{\mathrm{x}} \tan \theta$$

$$\frac{\mathrm{V}_{\mathrm{x}}}{\tan \theta}$$

$$\frac{\mathrm{V}_{\mathrm{x}}}{\sin \theta}$$

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

-0

A biconvex lens $$\left(R_1=R_2=30 \mathrm{~cm}\right)$$ has focal length equal to the focal length of concave mirror. The radius of curvature of concave mirror is [Refractive index of material of lens $$=1.6$$ ]

$$30 \mathrm{~cm}$$

$$40 \mathrm{~cm}$$

$$50 \mathrm{~cm}$$

$$20 \mathrm{~cm}$$

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