Question

A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let O be the pole
of the mirror and C its centre of curvature. A point object is placed at C. It has a real image, also located
at C. If the mirror is now filled with water, the image is
Mreal, and it remains at C
2) real, and it is located at a point between C and o
3) virtual and it is located at a point between C and O
4) real, and it is located at a point between C and O​

Answer 1

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Question From class 12 Chapter GEOMETRICAL OPTICS

A concave mirror is placed on a horizontal table with its axis directed vertically upward. Let O be the pole of the mirror C its center of curvature and F is the focus. A point object is placed at C. It has a real image, also located at C. If the mirror is now filled with water, the image will be

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Text Solution

real and will remain at C

real and located at a point between C and

real and located at a point between C and O

real and located at a point between C and F

Answer :

d.

Solution :

When there is no water in the mirror, the rays of light are incident normally on the mirror and retrace their path. So, we get an image coincident with the object as shown in the figure. <br> When the mirror is filled with water. Then the equivalent focal length F is given by <br>