Ray Optics Test...

An object is placed 12 cm to the left of a converging lens of focal length 8 cm. Another converging lens of 6 cm focal length is placed at a distance of 30 cm to the right of the first lens. The second lens will produce

The position of final image formed by the given lens combination from the third lens will be at a distance of f₁= + 10 cm, f₂ = – 10 m, f₃ = + 30 cm

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The imagewould be formed at

Two thin lenses of focal lengths f₁ and f₂ are in contact. The focal length of this combination is

An achromatic combination of lenses produces

If a parallel beam of white light is incident on a converging lens, the colour which is brought to focus nearest to the lens is

A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be

An object placed 10 cm in front of a lens has an image 20 cm behind the lens. What is the power of the lens (in dioptres)

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 of thelens will be

A point object is placed at the center of a glass sphere of radius 6 cm and refractive index 1.5. The distance of the virtual image from the surface of the sphere is