Advertisements
Advertisements
प्रश्न
A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen he should move the lens
(A) away from the screen
(B) towards the screen
(C) to a position very far away from the screen
(D) either towards or away from the screen depending upon the position of the object
उत्तर
To obtain a distinct image on the screen the student should move the lens towards the screen because in order to obtain a sharp image the screen should be near the lens and the object is at a distance so it means that we can get a sharp image only when the screen is near the lens.
Hence, the correct answer is towards the screen.
APPEARS IN
संबंधित प्रश्न
An object is placed at a distance of 40 cm in front of a convex mirror of radius of curvature 40 cm. List four characteristics of the image formed by the mirror.
A mirror forms an image which is 30 cm from an object and twice its height.
(a) Where must the mirror be situated?
(b) What is the radius of curvature?
(c) Is the mirror convex or concave?
What type of image/images are formed by:
a concave mirror?
Which mirror always produces a virtual, erect and diminished image of an object?
What type of mirror should be used as a shop security mirror?
How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?
If a driver has one convex and one plane rear-view mirror, how would the images in each mirror appear different?
Draw the given diagram in your answer book and complete it for the path of a ray of light after passing through the lens.
The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?
Assertion: A real image cannot be produced by plane or convex mirror.
Reason: The focal length of a convex mirror is always taken as positive.
