MCQ : A ray of light incident on a lens parallel to its principal axis, after refraction passes through or appears to come from Open Answer »
MCQ : No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be Open Answer »
State whether true or false: (i) A convex mirror is used as a driver’s mirror. (ii) The absolute refractive index of a medium can be less than unity. (iii) A band of seven colours of white light is called the spectrum. (iv) In a photographic camera, a concave lens is used. (v) To correct long-sightedness a concave lens of suitable focal length is used. Open Answer »
LAQ : Describe different parts of the human eye. Describe two major defects of the human eye and how they are remedied Open Answer »