Ray Optics Test...

Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of lens when immersed in a liquid of refractive index of 1.25 will be

The focal length of a convex lens depends upon

f_vand f_r are the focal lengths of a convex lens for violet and red light respectively and F_vand F_r are the focal lengths of a concave lens for violet and red light respectively, then

If a lens is cut into two pieces perpendicular to the principal axis and only one part is used, the intensity of the image

Two thin lenses whose powers are +2D and –4D respectively combine, then the power of combination is

A substance is behaving as convex lens in air and concave in water, then its refractive index is

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a

A double convex lens of glass of μ = 1.5 has radius of curvature of each of its surface is 0.2 m. The power ofthe lens is

A lens of focal power 0.5 D is

A double convex thin lens made of glass of refractive index 1.6 has radii of curvature 15 cm each. The focal length of this lens when immersed in a liquid ofrefractive index 1.63 is