29. How can we distinguish between plane mirror, concave mirror and convex mirror
without touching them.
Answers
Answer:
To distinguish between a plane mirror, a concave mirror and a convex mirror without touching it, bring each mirror near to your face one by one and note the change in size of the image formed. There can be following three cases.
Explanation:
Case 1 : In plane mirror, if the object is upright, the image is also upright, of same size and does not change in size by moving the mirror towards or away from the face.
Case 2 : In concave mirror, if the object is upright, the image is also upright but magnified and increases in size by moving the mirror away from the face.
Case 3 : In convex mirror, if the object is upright, the image is also upright but diminished and decreases in size by moving the mirror away from the face.
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We can differentiate between a convex and concave lens by seeing the image.
- On keeping the lens near a printed page, if letters appear magnified, the lens is convex and if the letters appear diminished, the lens is concave.
- On seeing a distant object through the lens, if its inverted image is seen, the lens is convex and if an upright image is seen, the lens is concave.