Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed. (a) at the centre of curvature of a concave mirror (b) between the pole P and focus F of a concave mirror (c) in front of a convex lens (d) at 2F of a convex lens (e) in front of a concave lens
Answers
To draw:
Image formed when the object is placed
(a) at the centre of curvature of a concave mirror
(b) between the pole P and focus F of a concave mirror
(c) in front of a convex lens
(d) at 2F of a convex lens
(e) in front of a concave lens.
Principles to be used:
- Paraxial rays from the object after reflection/refraction passes through the Principle Focus of the mirror or lens.
- For any mirror , rays through the centre of curvature will trace back its path after getting reflected.
- For any lens , rays passing through the optical centre shall remain undeviated.
Characteristic of images :
a) Image is formed at centre of curvature . Image is of same size , inverted and real.
b) Image is virtual and formed behind the mirror. Image is enlarged and erect.
c) Irrespective of the position of object , the image will be real and inverted. Depending upon the position , magnification varies.
d) Image will be formed at the centre of curvature of lens ; image will be real , inverted and same size as that of object.
e) Irrespective of the position of object , image will always be virtual, erect and diminished.
(Refer to all the diagrams)
Answer:
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