मराठी

Consider two statements A and B given below:A : real image is always invertedB : virtual image is always erectOut of these two statements:

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प्रश्न

Consider two statements A and B given below:
A: real image is always inverted
B:  virtual image is always erect
Out of these two statements:

पर्याय

  • Only A is true

  • Only B is true

  • Both A and B are true

  • None is true

MCQ
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उत्तर

both A and B are true

A real image is always inverted and a virtual image is always erect.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Reflection of Light - Exercise 6 [पृष्ठ ६०]

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लखमीर सिंह Physics Part 1 [English] Class 10
पाठ 1 Reflection of Light
Exercise 6 | Q 36. | पृष्ठ ६०

संबंधित प्रश्‍न

A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?


(a) At what distance should the lens be held from the figure in order to view the squares distinctly with the maximum possible magnifying power?

(b) What is the magnification in this case?

(c) Is the magnification equal to the magnifying power in this case? Explain.


Which has more power : a thick convex lens or a thin convex lens, made of the same glass? Give reason for your choice.


The focal length of a convex lens is 25 cm. What is its power? 


The power of a lens is, −2 D. What is its focal length?


What is the nature of a lens whose power is, −4 D?


The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm :
(a) calculate the focal length of lens Y.
(b) state the nature of lens Y.

 


Two lenses A and B have focal lengths of +20 cm and, −10 cm, respectively.
(a) What is the nature of lens A and lens B?
(b) What is the power of lens A and lens B?
(c) What is the power of combination if lenses A and B are held close together?


What do you understand by the power of a lens?


State the condition for the following a lens has both its focal lengths equal .


How is the power of a lens related to its focal length?


If the lens is of focal length 25 cm. Calculate the power of the lens.


If there is a convex lens of focal length 75 cm and a concave lens of focal length 40 cm, then calculate their combined power and combined focal length.


Assertion and reasoning type

  1. Assertion: Myopia is due to the increase in the converging power of eye lens.
  2. Reason: Myopia can be corrected with the help of concave lens.

The same size images are formed by a convex lens when the object is placed at 20 cm or at 10 cm from the lens. The focal length of convex lens is ______ cm.


The SI unit of the power of a lens is the:


A convex lens is a converging lens whose focal length and power are both:


A concave lens is a diverging lens whose focal length and power are both:


A greater numerical value of the power of a lens means:


When a lens is placed in a liquid, the total power of the lens is:


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