Q. The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm. If focal length of the lens is 12 cm. Find the refractive index of the material or the lens. Q.

The Haryana Board has published the 12th Class English Elective Syllabus. See the most recent Haryana Board Class 12 English ...

Physics bachelor’s that first attended a two-year college tended to be older, with a median age of 24, compared to a median ...