A pin AB of length 2 cm is kept on the axis of a convex lens between 18 cm and 20 cm as shown in figure. Focal length of convex lens is 10 cm. Find magnification produced for the image of the pin.
1. 0.83
2. 1.00
3. 1.25
4. 6.78
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
A person is suffering from both nearsightedness and farsightedness. His spectacles would be made up of:
1. two convex lenses with the upper lens having a larger focal length than that of the lower lens.
2. two concave lenses with the upper lens having a smaller focal length than that of the lower lens.
3. a concave lens as the upper lens and a convex lens as the lower lens
4. a convex lens as the upper lens and a concave lens as the lower lens
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
Two convex lens A and B, each of focal length 30 cm are separated by 30 cm, as shown in the figure. An object O is placed at a distance of 40 cm to the left of lens A.
What is the distance of the final image formed by this lens system?
1. 120 cm to the right of lens A
2. 90 cm to the right of lens A
3. 22.5 cm to the right of lens B
4. 45 cm to the right of lens B
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
In order to get an upright image, photographic slides must be placed upside down in a slide projector. What type of lens must the slide projector have?
1. concave
2. convex
3. plane
4. both a and b
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
Two plane mirrors are placed at a angle with respect to each other. A ray of light is incident upon mirror A at an angle of and is reflected toward mirror B. At what angle of reflection does the ray leave the surface of mirror B?
1.
2.
3.
4.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
A 20 cm object is placed 15 cm in front of a converging lens with a focal length of 10 cm. What is the height and location of the image created by the lens?
1. The image is 10 cm in size and is located 30 cm behind the lens.
2. The image is 10 cm in size and is located 20 cm behind the lens.
3. The image is 20 cm in size and is located 20 cm behind the lens.
4. The image is 40 cm in size and is located 30 cm behind the lens.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
A child stands between two mirrors with his arms out, perpendicular to the mirrors. One plane mirror is 5 m away from his left hand and another plane mirror is 7 m away from his right hand. How far apart are the two images produced by the mirrors if the child has an arm span of 0.5 m?
1. 2 m
2. 12 m
3. 12.5 m
4. 24.5 m
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
If a ray of light is incident on a plane mirror at an angle 60 from the mirror surface, then deviation produced by the mirror is:
1. 30
2. 60
3. 90
4. 120
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
The images of clouds and trees in water always less bright than in reality:
1. because water is forming the image dirty
2. because there is an optical illusion due to which the image appears to be less bright
3. because only a portion of the incident light is reflected and quite a large portion goes into water
4. because the air above the surface of the water contains a lot of moisture
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
A convex mirror has a focal length = 20 cm. A convergent beam tending to converge to a point 20 cm behind the convex mirror on the principal axis falls on it. The image is formed at:
1. infinity
2. 40 cm
3. 20 cm
4. 10 cm
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 14 chapters you need to be enrolled in MasterClass Course.
© 2025 GoodEd Technologies Pvt. Ltd.