2 convex lenses
2 concave lenses
1 convex, 1 concave lens
1 convex and 1 plane mirror
A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerge normally from opposite surface. If the refractive index of the material of prism is μ, the angle of incidence is nearly equal to :
μ A
A planoconvex lens is made of a material of refractive index μ = 1.5. The radius of curvature of curved surface of the lens is 20 cm. If its plane surface is silvered, the focal length of the silvered lens will be :
10 cm
20 cm
40 cm
80 cm
A lens is placed between a source of light and a wall. It forms images of area A1 and A2 on the wall, for its two different positions, the area of the source of light is
A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?
1 cm upward
4.5 cm downward
1 cm downward
2 cm upward
Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is is
2 × 10-4s
2 × 108s
2 × 10-11s
2 × 1011s
The hypermetropia is a
short-sight defect
long-sight defect
bad vision due to old age
None of the above
The wavelength of light of frequency 100Hz is :
2 × 106 m
3× 106 m
4 × 106 m
5 × 106 m
For the given incident ray as shown in figure, the condition of total internal reflection of the ray will be satisfied if the refractive index of block will be
Diameter of human eye lens is 2mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50m from eye? [The wavelength of light is 5000 Å]
2.32 m
4.28 mm
1.25 cm
12.48 cm