On a hot summer day in desert ,one sees the relected image of the distant objects.Explain,why.

The far point of a myopic person is 80 cm. In front of the eye. What is the power of the lens required to enable him to see very distant objects clearly ? In what way does the corrective lens help the person above?Does the lens magnify very distant objects?Explain.

Answer the following questions: When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?

Suppose the lower half of the concave mirror's reflecting surface is covered with an opaque material.What effect this will have on the image of the object?Explain.

What is the magnifying power of an astronomical telescope when the final image of a distant object is formed at least distance of distinct vision?

A certain person can see clearly objects at a distnaces btween 20 cm and 250 cm from his eye. What spectacles are required to enable him to see distant objects clearly?

One half of a convex lens is covered with a black paper .Will this lens produce a complete image of the object? Explain your observation

The far point of a myopic person is 80 cm. In front of the eye. What is the power of the lens required to enable him to see very distant objects clearly ? The person above prefers to remove his spectacles,while reaing a book.Explain,why.