Question

please give the answer of questions 4 ,8,10,11 from the above attachment..​

Answer 1

Explanation:

Ans. 4

For a ray passing through the optical centre of the lens, the incident and emergent ray are parallel but there is a lateral displacement b\w them, this displacement decreases as the thickness of the lens decreases and is negligible in a thin lens. Hence a ray passing through the optical centre of a thin glass goes straight without any deviation or displacement.

Ans. 8

The amount of light entering the eye is controlled by the pupil and further the size of the pupil is controlled by iris.

Ans. 11

Stars are present very far away from the earth. They are visible as point sources. The light rays which come from them, get refracted many times before they reach our eyes. Due to this, stars seem to be blinking or twinkling. Planets on the other hand, are located near to us, relatively to stars. So the diffraction of light does not occur much and planets do not seem to twinkle.

Sorry I didn't find question no. 10's answer

Answer 2

• Ans. 4 For a ray passing through the optical centre of the lens, the incident and emergent ray are parallel but there is a lateral displacement blw them, this displacement decreases as the thickness of the lens decreases and is negligible in a thin lens. Hence a ray passing through the optical centre of a thin glass goes straight without any deviation or displacement.
• Ans. 8 The amount of light entering the eye is controlled by the pupil and further the size of the pupil is controlled by iris.
• Ans. 11 Stars are present very far away from the earth. They are visible as point sources. The light rays which come from them, get refracted many times before they reach our eyes. Due to this, stars seem to be blinking or twinkling. Planets on the other hand, are located near to us, relatively to stars. So the diffraction of light does not occur much and planets do not seem to twinkle

refresh the image ok

and can you give me some thanks please!

because it is decreased by 50 percent questions no 10 is not going so seen answer in image