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प्रश्न
Draw a diagram to represent the second focus of a convex lens.
उत्तर
Convex lens representing second focus.
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संबंधित प्रश्न
A student is using a convex lens of focal length 18 cm to study the image formation by it for the various positions of the object. He observes that when he places the object at 27 cm, the location of the image is at 54 cm on the other side of the lens. Identify from the following diagram the three rays that are obeying the laws of refraction and may be used to draw the corresponding ray diagram.
(A) 1, 2 and 4
(B) 1, 3 and 5
(C) 2, 4 and 5
(D) 2, 3 and 4
Where should an object be placed in front of a convex lens so as to obtain its real, inverted and magnified image?
Explain with the help of a diagram, why the convex lens is also called a converging lens.
A lens forms an erect, magnified, and virtual image of an object. Name the type of lens.
When you focus the image of a distant flag, whose shape is given below, on a screen using a convex lens, the shape of the image as it appears on the screen is
(A)
(B)
(C)
(D)
For which position of the object does a convex lens form a virtual and erect image? Explain with the help of a ray diagram.
A pin 2 cm long is placed 12 cm away from a convex lens at right angles to the principal axis. If the focal length of the lens is 20 cm, by scale drawing find the size of the image and its magnification.
What is the difference between a double convex and a bi-convex lens?
Write scientific reason.
Adults need bifocal lens spectacle.
Distinguish between:
Concave lens and Convex lens
