TS EAMCET · Physics · Ray Optics
A Cassegrain telescope uses two mirrors of radii of curvature 25 cm and 16 cm separated by a distance of 2.5 cm. The position of the final image of an object at infinity is
- A 40 cm from convex mirror
- B 4.44 cm from concave mirror
- C 4.44 cm from convex mirror
- D 40 cm from concave mirror
Answer & Solution
Correct Answer
(C) 4.44 cm from convex mirror
Step-by-step Solution
Detailed explanation
\(f_1 = R_1 / 2 = 25 / 2 = 12.5 \text{ cm}\) \(u_1 = -\infty \implies v_1 = f_1 = 12.5 \text{ cm}\) \(f_2 = -R_2 / 2 = -16 / 2 = -8 \text{ cm}\) \(u_2 = +(v_1 - d) = +(12.5 - 2.5) = 10 \text{ cm}\) \(1/v_2 = 1/f_2 - 1/u_2 = 1/(-8) - 1/(10) = (-5 - 4)/40 = -9/40\)…
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