81)The lens which can form real and virtual images is
82)Which of the following is the formula for magnification of spherical mirror?
83)Unit of power of a lens
84)If a convex lens is placed in water, its focal length is
85)The focal length of eye lens changes between these values.
86)The relation between focal length and radius of curvature of a spherical mirror is
87)When objects of different distances are seen which of the following remain constant?
88)The minimum distance from a real object to the real image in a concave mirror is equal to
89)The mirror used as “Rearview” mirror in vehicles is
90)The relation between the speed of wave (v), wavelength (X) and frequency (n) is
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