आभासी प्रतिबिंब (Virtual image) और वास्तविक प्रतिबिंब (Real image) के बीच मुख्य अंतर क्या है?

What are the characteristics of an image formed by a plane mirror?

Given below are two statements: an Assertion [As] and a Reason [R]. Assertion [As]: A convex mirror cannot form real images of real objects. Reason [R]: Convex mirrors converge the parallel rays of light that are incident on them. Choose the correct alternative:

Optical fiber transmission operates on the principle of:

The magnifying power of an astronomical telescope is 10 and the focal length of its eyepiece is 20 cm. What is the focal length of its objective lens?

The converging or diverging ability of a lens or mirror is measured by its:

What type of image is always formed by a concave lens, no matter where the object is placed?

A light ray passes from a medium with a refractive index of 1.47 into a second medium with a refractive index of 1.65 at an oblique angle. Which of the following correctly describes the behavior of the light ray?

A scientist observes that when a light ray travels from medium A to medium B, the angle of refraction is larger than the angle of incidence. What can be concluded?