EASY
10th CBSE
IMPORTANT
Earn 100
A student determines the focal length of a device , by focusing the image of a far off object on the screen positioned as shown in the figure.
The device is a:
75% studentsanswered this correctly
Important Questions on Multiple Choice Questions
MEDIUM
10th CBSE
IMPORTANT
The focal length of the concave mirror in the experimental set up, shown alongside, equals:
MEDIUM
10th CBSE
IMPORTANT
While determining the focal length of a concave mirror, a student obtained the image of a distant object on a screen. In order to get the focal length of the mirror, the student should measure the distance:
HARD
10th CBSE
IMPORTANT
A student gets a blurred image of a distant object on a screen which is fixed at a place. In order to obtain a sharp image on the screen, he will have to shift the mirror:
MEDIUM
10th CBSE
IMPORTANT
Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below:
The correct value for focal length will be obtained by the student:
HARD
10th CBSE
IMPORTANT
A student has to do the experiment on finding the focal length of a given concave mirror by using a distant object. Out of the following 'set-ups' A, B, C and D available to him :
A: a screen, a mirror holder and a scale
B: a mirror holder, a screen holder and a scale
C: a screen holder and a scale
D: a mirror holder and a scale
The 'set-up' which is likely to give him the best result is:
HARD
10th CBSE
IMPORTANT
Four students A, B, C and D performed an experiment to determine the focal length of a concave mirror by using a lighted candle kept at a considerable distance as the object. They represented the position of image by drawing the following diagrams:
Which diagram describes the correct position of the image of the candle?
MEDIUM
10th CBSE
IMPORTANT
The parallel rays from the top of a distant tree are incident on a concave mirror forming its image on a screen.
The diagram which shows the image of the tree on the screen correctly is:
HARD
10th CBSE
IMPORTANT
In order to determine the focal length of a concave mirror, a student obtained a sharp image of the grill of a window in the laboratory wall on a screen. His teacher suggested that to get better result for focal length, he should focus a distant tree instead of the window grill. In which direction should the mirror be moved for this purpose so as to get a sharp image of the tree on the screen?
