MHT CET 2021 22th September Evening Shift | Ray Optics Question 73 | Physics

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)

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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 $$=1.6$$ ]

$$30 \mathrm{~cm}$$

$$40 \mathrm{~cm}$$

$$50 \mathrm{~cm}$$

$$20 \mathrm{~cm}$$

MHT CET 2021 22th September Morning Shift

MCQ (Single Correct Answer)

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The critical angle for light going from medium A into medium B is $$\theta$$. The speed of light in the medium A is $$\mathrm{V}_{\mathrm{A}}$$. What is the speed of light in the medium $$\mathrm{B}$$ ?

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

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

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

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

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