AP EAMCET · PHYSICS · Ray Optics
As shown in the figure, a parallel beam of light incidents on the upper part of a prism of angle \(1.8^{\circ}\) and material of refractive index 1.5. The light emerging out from the prism falls on a concave mirror of radius of curvature \(40 \mathrm{~cm}\). This distance of the point from the principal axis of the mirror where the light rays are focussed after reflection from the mirror is
- A 4.76 cm
- B 1.57 mm
- C 3.14 mm
- D 6.28 mm
Answer & Solution
Correct Answer
(B) 1.57 mm
Step-by-step Solution
Detailed explanation
Parallel beam is deviated by prism by angle, \( \begin{aligned} \delta & =(\mu-1) A=(1.5-1) \times 1.8^{\circ}=0.9^{\circ} \\ & =0.9^{\circ} \times \frac{\pi}{180^{\circ}} \text { radian } \end{aligned} \) This beam from prism is also parallel and is converged at a point in…
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