D. Short Answer Type Questions
1. What are mirrors? How many types of mirrors are there?
2. What is lateral inversion? Describe by giving an example,
3. Define principal focus and focal length.
4. What are converging and diverging lenses?
5. Differentiate between real and virtual images giving examples.
6. What is dispersion of light?
7. What are the uses of lenses?
Answers
Answer:
1 ans A mirror is defined as reflecting surface and can be explained by the law of reflection.
--Three common types of mirror are the plane mirror, which has a flat, or plane, surface; the convex mirror; and the concave mirror.
2 ans Lateral inversion is the real or apparentreversal of left and right. For example, the letter b when laterally inverted becomes the letter d (more or less). It is well-known that a plane mirror causes the apparent lateral inversion of objects
3 ans Principle focus is the point on the axis of a convex lens, where the parallel rays of light from one side of the lens. meet on other side after refraction. Distance between optical centre to principle focus point is thefocal length
4ans In this unit, we will categorize lensesas converging lenses and diverging lenses. A converging lens is a lensthat converges rays of light that are traveling parallel to its principal axis. ... A diverging lens is a lens that diverges rays of light that are traveling parallel to its principal axis.
5ans a real image can be displayed or projected onto a screen while a virtual image cannot.The best example for this is a cinema screen image versus your reflection in the mirror. ... Real images are produced by a convex lens and virtual images by a concave lens.
6ans dispersion is the phenomenon in which the phase velocity of a wave depends on its frequen
7ans A single convex lens mounted in a frame with a handle or stand is a magnifying glass. Lenses are used as prosthetics for the correction of visual impairments such as myopia, hypermetropia, presbyopia, and astigmatism. (See corrective lens, contact lens, eyeglasses.)
Explanation:
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