Question

2.5 Find the area of the region to be covered on the face of glass cube of side 5 cm so that
a spot at the centre cannot be seen from that face. y = 1.5 for the glass cube.​

Answer 1

Answer:

62.8 sq cm

Explanation:

Given Find the area of the region to be covered on the face of glass cube of side 5 cm so that

a spot at the centre cannot be seen from that face. y = 1.5 for the glass cube.

We know that radius is given by

R = h/√μ^2 – 1

Given h = 5 cm and μ = 1.5

Substituting we get

R = 5/√(1.5)^2 – 1

R = 5 / √1.25

Area of the region will be

A = π R^2

   = 22/7 x 25/1.25

A = 550/8.75

A = 62.8 sq cm

the area of the region to be covered on the face of glass cube will be 62.8 sq cm