Download App

Ray Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsRay Optics1 Mark
MCQ
A candle placed 25 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length and type of the lens should be
  • ✓
    + 18.75 cm and convex lens
  • B
    – 18.75 cm and concave lens
  • C
    + 20.25 cm and convex lens
  • D
    – 20.25 cm and concave lens
✓

Answer

Correct option: A.
+ 18.75 cm and convex lens
 + 18.75 cm and convex lens

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Ray Optics→Ray Optics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

If the refractive index of denser medium 1 relative to rare medium 2 is $n_{12}$ and the critical angle for the pair of these mediums is $i_{ c }$, then the relationship between $n _{12}$ and $i_c$ is :
→
Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are $2.8$ (medium -1) and $6.8$ (medium $2)$, respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be $\tan ^{-1}\left(1+\frac{10}{\theta}\right)^{\frac{1}{2}}$ the value of $\theta$ is $.............$ (Given for dielectric media, $\mu_{ r }=1$ )
→
A charge of 5 C is given a displacement of 0.5 m. The work done in the process is 10 J. The potential difference between the two points will be
→
Two light beams superimposed each other constructively this results in:
→
Consider a system of three charges $\frac{q}{3},\frac{q}{3}$ and $\frac{-2q}{3}$ placed at points $A,B$ and $C$, respectively, as shown in the figure. Take $O$ to be the centre of the circle of radius $R$ and angle $CAB = 60^o$
→
Dynamo is a device for converting
→
Two bodies at different temperatures are mixed in a calorimeter. Which of the following quantities remains conserved?
→
A solenoid has turn density $5000\,turn/m$ and cross sectional area $10\,cm^2$. If a current of $1\,A$ flow in it and inside material has relative permeability of $1000$, then find energy per unit length of solenoid......$J/m$
→
The electric field near a conducting surface having a uniform surface charge density σ is given by
→
For which of the following colour, the magnifying power of a microscope will be maximum
→