Questions
The radius of curvature of curved surface of a thin plano - convex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be
detailed solution
Correct option is D
R=10cm Plano convex lens μ=1.51fl=μ−11R1fl=0.5110=120When silvered at flat surface 1f=2fl+1∞1f=2fl=220=110 f=10cmTalk to our academic expert!
Similar Questions
A convex lens is at a distance of 10 cm from a convex mirror of focal length 10 cm as shown in figure. A beam of light parallel to the principal axis is incident on the tens. After refraction through the lens, reflection at the mirror and again refraction through the lens, the final emergent beam refraces the path of the incident beam then focal length of the lens is
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