A convex lens of focal length …

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A convex lens of focal length 20cm is placed in front of a convex mirror with principal axis coinciding each other. The distance between the lens and mirror is 10cm. A point object is placed on principal axis at a distance of 60 cm from the convex lens. The image formed by combination, coincides the object itself. The focal length of the convex mirror is ?? .

Posted by Topper Student 4 months ago

CBSE > Class 10 > Science

2 answers

Miss. Honey 4 months ago

Correct answer is 10. For final image to be formed on the object itself, after refraction from lens the ray should meet the mirror perpendicularly and the image by lens should be on the centre of curvature of mirror R = 30 - 10 = 20 cm Focal length of mirror = R/2 = 10 cm .

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Rohan Dhiman 4 months ago

Chemistry ch1

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