Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Physics Optics Refraction and Reflection
Double-convex lens are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. Find the radius of curvature required if the focal length is to be 30 cm?
1
22 cm
2
33 cm
3
44 cm
4
More than one of the above
5
None of the above