Question

Imagine a ray of light falls on a spherical mirror. (a)Will the ray follow the laws of reflection? Explain your answer.


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Answer 1

Answer: D

The angle of incidence is the angle between the incident ray and the normal. As this angle approaches 90 degrees, the reflected ray also approaches a 90 degree angle with the normal; thus, the angle between the incident and reflected ray approach 180 degrees.

Answer 2

Answer:

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Imagine a ray of light falls on a spherical mirror. (a)Will the ray follow the laws of reflection? Explain your answer.

⚡Answer ✔

↬A ray of light from the centre of curvature falls normally on the spherical mirror. So, its angle of incidence is 0°. A concave lens of focal length 15 cm forms an image 10 cm from the lens.

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• Rule 1: After reflection, a ray of light parallel to the principal axis appears to be coming from focus.
• Rule 2: A ray of light going towards centre of curvature is reflected back along the same path.
• Rule 3: After reflection, a ray of light going towards the focus becomes parallel to the principal axis.

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The point in the center of the sphere from which the mirror was sliced is known as the center of curvature and is denoted by the letter C in the diagram below. The point on the mirror's surface where the principal axis meets the mirror is known as the vertex and is denoted by the letter A in the diagram below.

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