>
Exams
>
Physics
>
Ray optics and optical instruments
>
an object is placed 30 cm in front of a concave mi
Question:
An object is placed 30 cm in front of a concave mirror (radius of curvature 40 cm). Find: (i) image position (ii) magnification
Show Hint
Remember sign conventions for u, v, and f.
CBSE CLASS XII - 2024
CBSE CLASS XII
Updated On:
Feb 16, 2025
Hide Solution
Verified By Collegedunia
Solution and Explanation
(i) 1/v + 1/u = 1/f. u = -30cm, f = -R/2 = -20cm. Solving for v: v = -60cm. (ii) m = -v/u = -(-60)/(-30) = -2.
Download Solution in PDF
Was this answer helpful?
0
0
Top Questions on Ray optics and optical instruments
Explain the transmission of optical signal through an optical fiber with a diagram.
CBSE CLASS XII - 2025
Physics
Ray optics and optical instruments
View Solution
With the help of a ray diagram, show that a straw appears bent when it is partly dipped in water and explain it.
CBSE CLASS XII - 2025
Physics
Ray optics and optical instruments
View Solution
When a parallel beam of light enters water surface obliquely at some angle, what is the effect on the width of the beam?
CBSE CLASS XII - 2025
Physics
Ray optics and optical instruments
View Solution
Two convex lenses A and B, each of focal length 10.0 cm, are mounted on an optical bench at 50.0 cm and 70.0 cm respectively. An object is mounted at 20.0 cm. Find the nature and position of the final image formed by the combination.
CBSE CLASS XII - 2025
Physics
Ray optics and optical instruments
View Solution
The focal length of a concave mirror in air is \( f \). When the mirror is immersed in a liquid of refractive index \( \frac{3}{5} \), its focal length will become:
CBSE CLASS XII - 2025
Physics
Ray optics and optical instruments
View Solution
View More Questions
Questions Asked in CBSE CLASS XII exam
A battery of emf \( E \) and internal resistance \( r \) is connected to a rheostat. When a current of 2A is drawn from the battery, the potential difference across the rheostat is 5V. The potential difference becomes 4V when a current of 4A is drawn from the battery. Calculate the value of \( E \) and \( r \).
CBSE CLASS XII - 2025
Current electricity
View Solution
An electric dipole of dipole moment \( 1.0 \times 10^{-12} \ \text{Cm} \) lies along the x-axis. An electric field of magnitude \( 2.0 \times 10^4 \ \text{NC}^{-1} \) is switched on at an instant in the region. The unit vector along the electric field is \( \frac{\sqrt{3}}{2} \hat{i} + \frac{1}{2} \hat{j} \). The magnitude of the torque acting on the dipole at that instant is:
CBSE CLASS XII - 2025
torque
View Solution
Differentiate
\(\frac{\sin x}{\sqrt{\cos x}}\) with respect to x.
CBSE CLASS XII - 2025
Differentiation
View Solution
State Faraday’s second law of electrolysis. How much electricity is required in terms of Faraday for the reduction of 1 mole of $Cr_2\text{O}_7^{2-} \text{ to Cr}^{3+}$?
CBSE CLASS XII - 2025
Electrochemistry
View Solution
Two wires P and Q are made of the same material. Wire Q has twice the diameter and half the length of wire P. If the resistance of wire P is \( R \), the resistance of wire Q will be:
CBSE CLASS XII - 2025
Current electricity
View Solution
View More Questions