Question

. When a ladder of length 2.5 m leans against the
top edge of a window of a building, it forms an angle
of 55° with the ground. When the ladder leans
against the lower edge of the same window,
it forms an angle of 38° with the ground. Find the
height of the window, giving your answer in
centimetres.

Answer 1

Answer:

(c) when it goes from 12 to 9.

Hypermetropia can be corrected by convex lens. A convex lens converges the incoming light such that the image is formed on the retina. An object at 25 cm forms an image at the near point of the hypermetropic eye. Here, near point is 1 m. Given, Object distance,u=-25 cm Image distance, v=-100 cm 1. From lens formula, V 1