Question

1. Find radius of sun, the distance bet ween sun and earth is 8x10 m, and the sun subtends an angle30' at the eye of own observer on earth​

Answer 1

Answer:

Correct option is

B

1.39×10

9

m

Given, θ=1920"=

3600

1920

=0.53

o

=0.53×(π/180)=0.0093 radian

and D=1.496×10

11

m

Here, tanθ=d/D

As θ is very small so tanθ∼θ

So, diameter of the sun is d=Dθ=1.496×10

11

×0.0093=1.39×10

9

m

Answer 2

Answer:

The sun subtends at an angle (1/2)

0

,

The focal length of the convex lens, f=100cm

from the above figure,

θ in rad=

radius

arc

=

f

x

as we know that, π=180

0

So,

180 π × 21 = 100cm x

x=0.872cm=8.72mm

The diameter of the image obtained on the screen is 8.72mm

Step-by-step explanation:

hope it helps!