What happens after refraction, when :(i) a ray of light parallel to the principal axis passes through a concave lens?(ii) a ray of light falls on a convex lens while passing through its principal focus?(iii) a ray of light passes through the optical centre of a convex lens?
(i) When a ray of light parallel to the principal axis passes through a concave lens, then it gets diverged and appears to be coming from its focus.
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(ii) When a ray of light falls on a convex lens while passing through its principal focus, then it appears parallel to the principal axis after refraction through the lens.
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(iii) When a ray of light passes through the optical centre of a convex lens, then it goes straight after refraction through the lens.
Image is posted for reference only
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- Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path.
- A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.
- Draw a ray diagram in each of the following cases to show the formation of the image, when the object is placed :(i) between optical centre and principal focus of a convex lens.(ii) anywhere in front of a concave lens.(iii) at 2F of a convex lens.State the signs and values of magnifications in the above mentioned cases (i) and (ii).
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