MHT CET 2021 22th September Morning Shift | Ray Optics Question 75 | Physics

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)

-0

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 $$\mathrm{B}$$ ?

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

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

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

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

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

The refractive index of glass is 1.5 and that of water is 1.33 . The critical angle for a ray of light going from glass to water is

$$\sin ^{-1}\left(\frac{4}{7}\right)$$

$$\sin ^{-1}\left(\frac{5}{8}\right)$$

$$\sin ^{-1}\left(\frac{8}{9}\right)$$

$$\sin ^{-1}\left(\frac{2}{3}\right)$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

A convex lens is dipped in a liquid whose refractive index is equal to refractive index of lens material. Then its focal length will

increase

remain unchanged

become infinite

become zero

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