By mistake, an eye surgeon puts a concave lens in place of the lens in the eye after a cataract operation. Will the patient be able to see clearly any object placed at any distance?

Why is a normal eye not able to see clearly the objects placed closer than 25 cm ?

A concave lens is placed in water. Will there be any change in focal length? Give reason.

A convex lens is placed in water. a. Will there be any change in its focal length? B. Give reason.

A normal human eye can see clearly when objects are placed between ________ and _________ .

A double convex lens made of glass of refractive index 1.5 has both radii of curvature 20 cm each. Find the focal length of the lens. If an object is placed at a distance of 15 cm from this lens, find the position of the image formed.

A nearsighted person cannot clearly see beyond 200 cm. Find the power of the lens needed to see objects at large distances.

When a person uses a convex lens as a simple magnifying glass, the object must be placed at a distance __________.

a. The far point of a myopic person is 80cm in front of the eye. What is the power of the lens required to enable him to see very distant object clearly ? b. In what way does the corrective lens help the above person ? Does the lens magnify very distant objects? Explain carefully. c. The above person profers to remove his spectacles while reading a book Explain why.

A screen is placed a distance 40 cm away from an illuminated object. A converging lens is placed between the source and the screen and it is attempted to form the image of the source on the screen. If no position could be found, the focal length of the lens

An object is placed at a distance of 30 cm from a converging lens of focal length 15 cm. A normal eye (near point 25 cm, far point infinity) is placed close to the lens on the other side. (a) Can the eye see the object clearly? (b) What should be the minimum separation between the lens and the eye so that the eye can clearly see the object?