JEE MAIN - Physics (2021 - 26th August Evening Shift - No. 26)
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.
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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)
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)
Answer
50
Explanation
_26th_August_Evening_Shift_en_26_4.png)
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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