A student obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, he will have to shift the mirror:

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Towards the screen

Away from the screen.

Either towards or away from the screen depending upon the position of the screen.

To a position very far away from the screen.

answer is C.

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Detailed Solution

Concept: Glasses have a specific property of which we're veritably familiar with. They can reflect the clear image of the object which is placed in front of it. hollow glass comes under the order of twisted glass. Since the light shafts meet at a point in the top axis after the reflection, it’s also known as clustering glass. Focus is the point where all the light shafts coincide after reflection.
Hollow glass can form both real and virtual images depending on the distance between the glass and the object.
Real image The image formed when shafts of light match at a point after reflection/ refraction is called real image. It'll be reversed, sharp and its height will always be equal or lower than the size of the object. It's formed on the same side of the object.
Virtual image The image formed when shafts of light appear to meet( when diverging shafts are extended) at a point. Its height will be always lesser than the height of the object and appear to be formed on the other side of the object. And it's always standing and blurred.
Case 1. If the object is placed in front of the glass.
Then the image is formed at the aft side of the glass. It's standing and magnified. So, it's a virtual image.
Case 2.
If the object is placed at the F.
Then the image formed in front of the glass. The image is formed at perpetuity. It's reversed and the height of the image is the same as that of the object. Hence, it’s a real image. also we will get a sharp image.
Case 3.
If the object is placed beyond C.
Then also the image is formed on the same side of the glass. It's reversed and lower than the object. So, by looking into the parcels we can conclude, it's a real image.
In conclusion, we can say that it depends on the position of the object whether we need to move the screen down or near to the glass.
Hence, the correct answer is 3.

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