Ray Optics Test...

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 obtained is

A plane mirror produces a magnification of

The astronomical telescope consists of objective and eye-piece. The focal length of the objective is

An air bubble in a glass slab (µ = 1.5) is 5 cm deep when viewed from one face and 2 cm deep when viewed from the opposite face. The thickness of the slab is

A convex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and of the same material as P are now added as shown in Fig. The ray will now suffer

Critical angle for light going from medium (i) to (ii) is Ө. The speed of light in medium (i) is u. Then speed in medium (ii) is

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, the radius of this circle in cm is

A concave lens is in contact with convex lens. The ratio of the magnitude of their power is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths in cm?

A telescope has an objective lens of focal length 200 cm and an eye piece with focal length 2 cm. If this telescope is used to see a 50 m tall building at a distance of 2 km, what is the height of the image of the building formed by the objective lens