Light

What happens to the focal length of a convex lens when it is immersed in water?

A point source of light is placed at the focus of a convex lens. The emerging rays will be:

If the image distance (v) is 20 cm and object distance (u) is -10 cm for a lens, what is the magnification?

Which defect of vision occurs due to the gradual weakening of ciliary muscles in old age?

A ray of light passes through the optical center of a thin lens. What is its path?

Calculate the focal length of a convex lens which forms a real image at 20 cm when an object is placed 20 cm away.

What is the cause of 'Twinkling of Stars'?

In a periscope, the two plane mirrors are placed:

If an object is placed between the focus and the optical center of a convex lens, the image is:

The angle of deviation of a prism is minimum when:

A ray of light enters from glass (n=1.5) to water (n=1.33). The ray will:

What is the shape of the wavefront for light coming from a very distant star?

Which of the following describes the 'Lateral Displacement' of light?

A convex mirror always forms an image that is:

Which color deviates the most in a rainbow?

What is the magnification if the object height is 5 cm and the image height is 10 cm?

A lens of power +2.5 D is used by a person. What is the type of defect and the focal length?

The focal length of a concave mirror is 10 cm. If an object is at 20 cm, where is the image?

The 'Mirage' phenomenon is an example of:

When light enters a prism, why does it split?