Light from sun falling on a convex lens will converge at a point called A centre of curvature
B focus C radius curvature D optical centre

B

Explanation:

Light from the Sun falling on convex lens will converge at a point called a principal focus

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be