Question

1) State the differences between convex and concave mirrors?
2) Distinguish between real and virtual images.
3) How do you get a virtual image using a concave mirror?
What do you know about the terms given below related to sph
a) Pole
b) Centre of curvature c) Focus
d) Radius of curvature e) Focal length f) Principal a
g) Object distance
h) Image distance i) magnification​

Answer 1

Answer:

(1)concave mirror :-

1. Made by silvering the outer surface of a part of the hollow glass sphere.
2. Converging in nature.
3. Image may be real or virtual depending on the position of the object.

convex mirror :-

1. Made by silvering the inner surface of a part of the hollow glass sphere.
2. Diverging in nature.
3. Image is virtual.

(2) A real image and a virtual image are different forms of image. The main difference between real and virtual images lies in the way in which they are produced. A real image is formed when rays converge, whereas a virtual image occurs where rays only appear to diverge.

(3) The object should be placed in front of the concave mirror between the pole and the principal focus (i.e. object distance < 20 cm) to obtain an erect image. This image is virtual, erect and enlarged, and is formed behind the mirror.

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Answer 2

Answer:

ans 2)A real image and a virtual image are different forms of image. The main difference between real and virtual images lies in the way in which they are produced. A real image is formed when rays converge, whereas a virtual image occurs where rays only appear to diverge.

Ans 3) The object should be placed in front of the concave mirror between the pole and the principal focus (i.e. object distance < 20 cm) to obtain an erect image. This image is virtual, erect and enlarged, and is formed behind the mirror.

Ans 4) a. Pole: The centre of the spherical surface of the mirror, is called the pole of the mirror. It lies on the surface.

b. the center of the circle whose center lies on the concave side of a curve on the normal to a given point of the curve and whose radius is equal to the radius of curvature at that point.

c. In physics, a focus is “a point at which rays of light, heat, or other radiation meet after being refracted or reflected.” Perhaps you can imagine how a fireplace or a hearth—contained areas and sources of heat and light—was likened to such a point in math and science.

d. In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.

e. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.

f. principle is a rule or mechanism by which specific scientific phenomena work. Principles typically have more requirements or criteria when it can be used.

g. The object distance is the distance of the object to the centre line of the lens. This is denoted by the symbol do . The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens.

h. object distance is the distance of the object to the centre line of the lens. This is denoted by the symbol do . The image distance (sometimes confused with the focal length) is the distance of the image to the centre line of the lens.

i. Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a calculated number also called "magnification". When this number is less than one, it refers to a reduction in size, sometimes called minification or de-magnification.

Explanation:

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