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QJEEM21Phc2a4: JEE Main 2021 Physics - Class 12 JEEM21Phc2a4 Solution: An object is placed at a distance of 12 cm from a convex lens.…

An object is placed at a distance of 12 cm from a convex lens. A convex mirror of focal length 15 cm is placed on other side of lens at 8 cm as shown in the figure. Image of object coincides with the object.

JEE Main 2021 (Online) 26th August Evening Shift Physics - Geometrical Optics Question 113 English
When the convex mirror is removed, a real and inverted image is formed at a position. The distance of the image from the object will be .............. (cm)

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JEE Main 2021 (Online) 26th August Evening Shift Physics - Geometrical Optics Question 113 English Explanation

For the object to coincide with image, the light must fall perpendicularly to mirror. Which means that the light will have to converge at C of mirror. Without the mirror also, the light would coverage at C.

So the distance is : 12 + 8 + 30 = 50 cm

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