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प्रश्न
Name the lens which can concentrate sun's rays to a point and burn a hole in a piece of paper.
उत्तर
A convex lens can concentrate the sun's rays to a point and burn a hole in a piece of paper.
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संबंधित प्रश्न
Name the type of mirror used in the following situation:
Headlights of a car
Support your answer with reason.
Make labelled ray diagrams to illustrate the formation of:
a virtual image by a converging mirror.
Mark clearly the pole, focus, centre of curvature and position of object in each case.
The image formed by a concave mirror is of the same size as the object, if the object is placed
How can a concave mirror be used to obtain a virtual image of an object? Draw a diagram to illustrate your answer.
A student has to trace the path of a ray of light passing through a rectangular glass slab for four different values of angle of incidence.
(a) Write two important precautions for this experiment.
(b) List two conclusions the student will draw based on his experiment.
In which equipment/s do you find ___________________
Choose the correct option from given alternative:
Consider the following properties of virtual images:
(A) cannot be projected on the screen
(B) are formed by both concave and convex lens
(C) are always erect
(D) are always inverted
Answer the following question:
An object is placed at a distance of 30 cm from a concave lens of focal length 30 cm.
(i) Use the lens formula to determine the distance of the image from the lens.
(ii) List four characteristics of the image (nature, position, size, erect/inverted) in this case.
(iii) Draw a labelled diagram to justify your answer of the part (ii)
The ENT doctor uses a ______.
