CBSE Class 10 Science 2019 · Paper 31/5/1 · Question 7(a)
A concave mirror has a focal length of 20 cm. At what distance from the mirror should a 4 cm tall object be placed so that it forms an image at a distance of 30 cm from the mirror ? Also calculate the size of the image formed.
Answer
The object should be 60 cm in front of the mirror; the image is 2 cm tall, real and inverted.
The object must be placed at cm, that is 60 cm in front of the mirror. The image size is cm: the image is 2 cm tall and inverted (), real and diminished, formed 30 cm in front of the mirror between and .
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