1
KCET 2023
+1
-0

For a given pair of transparent media, the critical angle for which colour is maximum?

A
Green
B
Red
C
Blue
D
Violet
2
KCET 2023
+1
-0

An equiconvex lens made of glass of refractive index $$\frac{3}{2}$$ has focal length $$f$$ in air. It is completely immersed in water of refractive index $$\frac{4}{3}$$. The percentage change in the focal length is

A
$$400 \%$$ increase
B
$$300 \%$$ decrease
C
$$400 \%$$ decrease
D
$$300 \%$$ increase
3
KCET 2023
+1
-0

A point object is moving at a constant speed of 1 ms$$^{-1}$$ along the principal axis of a convex lens of focal length 10 cm. The speed of the image is also 1 ms$$^{-1}$$, when the object is at ............. cm from the optical centre of the lens.

A
10
B
15
C
20
D
5
4
KCET 2022
+1
-0

The power of a equi-concave lens is $$-4.5 \mathrm{D}$$ and is made of a material of refractive index 1.6, the radii of curvature of the lens is

A
$$36.6 \mathrm{~cm}$$
B
$$-266 \mathrm{~cm}$$
C
$$115.44 \mathrm{~cm}$$
D
$$-26.6 \mathrm{~cm}$$
EXAM MAP
Medical
NEET