Advertisements
Advertisements
Question
For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object.
(1) a well lit distant tree
(2) window grill in the class room
(3) any distant tree
(4) a lighted candle kept at the other end of the table.
Solution
(1) a well lit distant tree
APPEARS IN
RELATED QUESTIONS
Draw a ray diagram to show the formation of image in the above situation
State any two uses of convex lenses.
A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 cm from it. Calculate focal length of the lens.
What kind of lens can form:
am erect diminished image?
A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.
At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?
The diagram alongside shows the refraction of a ray of light from sir to a liquid.
(a) write the values of (i) angle of incidence, (ii) angle of refraction.
(b) use snell’s law to find the refractive index of liquid with respect to air.
A lens forms an upright and magnified image of an object State whether the image is real or virtual
In the following cases, where must an object be placed in front of a convex lens so that the image formed is inverted and enlarged?
Define the terms principal foci and focal lengths as applied to a convex lens, and show them with the help of proper diagrams.
Distinguish between:
Concave lens and Convex Lens
