Please answer them...
The focal length of a concave mirror is 2 cm. To use it as a dentist's mirror, what should be the distance of the tooth ?
An Object is kept at a distance of 5m from a convex mirror of radius of curvature 3m. Find the magnification in the image formed by the mirror.
A convex lens of focal length 2m and a concave lens of focal length 3m are placed in contact with each other. Find the power (in D) of their combination.
An object is kept at a distance of 25 cm in front of a converging lens of focal length 10cm. Find the distance of the image from the mirror.
Explanation not needed... Please it's urgent
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The focal length of a concave mirror is = 2.5 cm. As we know that when the object is placed between the focus and the pole of the concave mirror,the magnified image is formed. So, the distance of the tooth from the mirror should be 2.5 cm, so that dentist can see the enlarge view of tooth.
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