1
MHT CET 2021 22th September Morning Shift
+1
-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 $$=1.6$$ ]

A
$$30 \mathrm{~cm}$$
B
$$40 \mathrm{~cm}$$
C
$$50 \mathrm{~cm}$$
D
$$20 \mathrm{~cm}$$
2
MHT CET 2021 22th September Morning Shift
+1
-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 $$\mathrm{B}$$ ?

A
$$\mathrm{V}_{\mathrm{A}} \sin \theta$$
B
$$\mathrm{V}_{\mathrm{A}} \tan \theta$$
C
$$\frac{\mathrm{V}_{\mathrm{A}}}{\tan \theta}$$
D
$$\frac{\mathrm{V}_{\mathrm{A}}}{\sin \theta}$$
3
MHT CET 2021 21th September Evening Shift
+1
-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

A
$$\sin ^{-1}\left(\frac{4}{7}\right)$$
B
$$\sin ^{-1}\left(\frac{5}{8}\right)$$
C
$$\sin ^{-1}\left(\frac{8}{9}\right)$$
D
$$\sin ^{-1}\left(\frac{2}{3}\right)$$
4
MHT CET 2021 21th September Evening Shift
+1
-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

A
increase
B
remain unchanged
C
become infinite
D
become zero
EXAM MAP
Medical
NEET