Match the corresponding entries of column 1 with column 2. [Where m is the magnification produced by the mirror]

Column 1			Column 2
(A)	m = - 2		(p)	Convex mirror
(B)	m = -$${1 \over 2}$$		(q)	Concave mirror
(C)	m = +2		(r)	Real image
(D)	m = +$${1 \over 2}$$		(s)	Virtual image

A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively. To view an object 200 cm away from the objective, the lenses must be separated by a distance

The angle of incidence for a ray of light at a refracting surface of a prism is 45^o. The angle of prism is 60^o. If the ray suffers minimum deviation through the prism, the angle of minimum deviation and refractive index of the material of the prism respectively, are

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