A concave lens has a focal length of 10cm. At what distance from the lens should the object be placed so that it forms a real and inverted image 20cm from the lens. What should be the size of the image formed if the object is 2cm height?
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If the object is placed 20cm away from the lens which has focal length 10cm then the image will be same size as the object because if focal length(f)=10 then centre of curvature will 2f that is 2×10=20cm. If the object is placed at centre of curvature the image will be inverted,real and SAME SIZE as the object which is 2cm
The image size(hieght) is 2cm
Hope it helps... : )
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