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As shown in the figure , a parallel beam of light incidents on the upper part of a prism of angle 1.8^(@) and material pf refractive index 1.5 . The light emerging out from the prism falls on a convature 40 cm. This distance of the point from the principal axis of the mirror where the light rays are focussed after reflection from the mirror is |
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Answer» 4.76 cm `=0.9^(@) xx (pi)/(180^@)` radian This beam from prism is also parallel and is converged at point in focal PLANE by concave mirror .  Distance `x = F xx delta= (R)/(2) xx delta = (20)/(2) xx 0.9 ^(@) xx (pi)/(180^@)` =0.157 cm = 1.57 mm |
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