CBSE Class 10 Science 2019 · Paper 31/2/3 · Question 16(a)
A 6 cm tall object is placed perpendicular to the principal axis of a concave mirror of focal length 30 cm. The distance of the object from the mirror is 45 cm. Use mirror formula to determine the position, nature and size of the image formed. Also draw labelled ray diagram to show the image formation in this case.
Answer
cm: the image is real, inverted and enlarged, formed 90 cm in front of the mirror, 12 cm tall.
Position: cm, that is, the image is formed cm in front of the mirror, beyond C.
Nature: real and inverted (and enlarged).
Size: , so cm: the image is cm tall, twice the size of the object.
The labelled ray diagram shows the two rays from B meeting at B′, beyond C.
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