31. An endoscope is a
32. Retina of the eye is comparable to which of the following parts of a traditional camera?
33. The blue colour of sky is due to
34. Power of Sunglass is
35. The radius of curvature of a concave mirror is 30 cm. Following cartesian sign convention, its focal length is expressed as:
36. Light is made of seven colours. What is the method of separating the colours?
37. In mirrors, the back surface is coated with a thin layer of
38. Travelers in deserts often tend to have an optical illusion of a sheet of water where none actually exists. What is this called?
39. The blue colour of the sky is due to the:
40. Hypermetropia can be corrected by using:
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