Ray Optics Test...

The refractive index of the material of a double convex lens is 1.5 and its focal length is 5 cm. If the radii of curvature are equal, the value of the radius of curvature (in cm) is

The least angle of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is

Lenses of power 3 D and – 5 D are combined to from a compound lens. An object is placed at a distance of 50 cm from this lens. Its image will be formed at a distance from the lens, will be

A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now, this lens has been used to from the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?

A point object is placed at distance of 20 cm from a thin plano-convex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at

The graph between object distance u and image distance v for lens is given below. The focal length of the lens is

Which of the following is true for rays coming form infinity?

A convex lens made up of a material of refractive index µ₁ is immersed in a medium of refractive index µ₂ as shown in the figure. The relation between µ₁ and µ₂ is

If a flint lens glass of dispersive power 0.066 renders achromatic to a convex lens of crown glass of focal length 60 cm and dispersive power 0.033, then its focal length is

A thin plano-convex lens acts like a concave mirror of focal length 0.2 m when silvered from its plane surface. The refractive index of the material of the lens is 1.5. The radius of curvature of the convex surface the lens will be