Determine the angle of deviation for the refraction of light rays from rarer to denser medium. [2] (angle of incidence = i, angle of refraction = r) OR Why do the green leaves of trees appear 'green' in sunlight? [2]

What is long-sightedness? What type of lens is used to remedy this defect? [2+1]

If the refractive indices of a medium for red and blue colours of light are μr and μb respectively, which one is greater in magnitude?

Which type of mirror is used in the headlight of a motor car?

Is it possible to form a virtual image of shorter length than the length of the object by any mirror?

Dentists use (a) convex mirror (b) convex lens (c) concave mirror (d) concave lens

The wavelength of which of the following is greater than that of visible light? (a) x-ray (b) infrared ray (c) γ - ray (d) ultraviolet ray

If the radius of curvature of a concave mirror is 20 cm, then focal length of the mirror will be (a) 20 cm (b) 15 cm (c) 10 cm (d) 40 cm

Whether a concave lens is called a converging or diverging lens? Answer with reason.

Write Snell's law of refraction of light. OR Write two characteristics of the image of an extended object formed when it is placed in between the optical centre and focus of a thin convex lens.

Explain with a diagram why the sky appears blue.

Why is the red colour selected for danger signal lights?