Advertisements
Advertisements
प्रश्न
Where should an object be placed in front of a convex lens so as to form an inverted and enlarged image? Will the image be real or virtual? Draw a ray diagram to illustrate your answer.
उत्तर
To form an inverted and enlarged image by a convex lens, the object should be placed between F and 2F in front of the lens.
The image will be real.
The ray diagram is shown in the figure. For the object AB, the images are A’B’.
APPEARS IN
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
A student has obtained a magnified image of a flame on a screen using a convex lens. To draw the corresponding ray diagram to show the image formation, which of the following two rays whose paths after refraction are shown, should he select ?
(A) I and II
(B) II and III
(C) III and IV
(D) I and III
A beam of light travelling in a rectangular glass slab emerges into air. Draw a ray-diagram indicating the change in its path.
An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens.
In a certain murder investigation, it was important to discover whether the victim was long-sighted or short-sighted. How could a detective decide by examining his spectacles?
A lens forms an upright and magnified image of an object. Name the lens.
Distinguish between:
Concave lens and Convex lens
Can a normal convex lens behave like a concave lens and vice-versa?
Object at 2F1 of a convex lens : Image at 2F2 : : Object at F1 : _______
Distinguish between:
Concave lens and Convex Lens