Question:
Which of the following is the unit of power of lens?
Which of the following is the unit of power of lens?
Show Hint
The power of a lens is measured in dioptres, and it is calculated as the inverse of the focal length (in meters).
Updated On: Oct 28, 2025
- Dioptre
- Watt
- cm
- Joule
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
The unit of lens power is dioptre (D), defined as the reciprocal of the focal length in meters.
Was this answer helpful?
0
0
Top Questions on Light
- Draw a ray diagram to show image formation by a concave mirror when the object is placed between focus and center of curvature.
- Based on the given data, determine the image position formed by a spherical mirror: \[ u = -20\, \text{cm}, f = -15\, \text{cm} \]
- A real image of a body is formed by a concave mirror of 50 cm focal length at a distance of –1 focal length. What is the distance between the image and the object?
- When light enters a different medium, its wavelength changes because:
- Name the type of lenses required by the persons for the correction of their defect of vision called presbyopia. Write the structure of the lenses commonly used for the correction of this defect giving reason for such designs.
View More Questions
Questions Asked in Bihar Class X Board exam
- One day the old emperor Shah Jahan became ill. His son Aurangzeb, who always wanted to be the emperor, put his father in a jail. Jahanara Begum, the eldest child of Shah Jahan, did not leave her father and went to jail along with him. She said, “I shall share the suffering of my father. He needs me in his old age, and I shall never leave him.” Shah Jahan spent seven years in jail before dying. During that period, Princess Jahanara stayed there and took care of him. After the death of her father, she returned to her own palace and continued to live there till her death. Before her death, however, she gave away all she had to the needy and the poor. Upon her death, Aurangzeb gave her the posthumous title : Sahibat-uz-Zamani (mistress of age).
- Bihar Board X - 2025
- Reading Comprehension
- Choose the passive voice of : “Have this lock broken.”
- Choose the most suitable translation : वे लोग विद्यालय जा चुके हैं।
- Bihar Board X - 2025
- Comparative Literature and Translations Studies
- Choose the most suitable translation : उसने मुझे सोया हुआ पाया।
- Bihar Board X - 2025
- Comparative Literature and Translations Studies
- Choose the most suitable translation : नियमित रूप से अध्ययन करो।
- Bihar Board X - 2025
- Comparative Literature and Translations Studies
View More Questions