Question:
The magnification produced by a concave mirror of focal length 10 cm is positive, if the value of object distance is:
The magnification produced by a concave mirror of focal length 10 cm is positive, if the value of object distance is:
Show Hint
For concave mirrors, virtual and erect images are formed when the object is placed within the focal length.
Updated On: Oct 27, 2025
- more than 10 cm
- more than 20 cm
- less than 10 cm
- none of these
Hide Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
The magnification of a mirror is given by:
\[ m = \frac{-v}{u} \] For concave mirrors, magnification is positive when the image is virtual and erect. This happens when the object is placed between the focus and the pole of the mirror, i.e., when \( u<10 \) cm.
Thus, the correct answer is \( \mathbf{(C) \text{less than 10 cm}} \).
\[ m = \frac{-v}{u} \] For concave mirrors, magnification is positive when the image is virtual and erect. This happens when the object is placed between the focus and the pole of the mirror, i.e., when \( u<10 \) cm.
Thus, the correct answer is \( \mathbf{(C) \text{less than 10 cm}} \).
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