Download App

Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments2 Marks
Question
Answer the following question:
 virtual image, we always say, cannot be caught on a screen.
Yet when we 'see' a virtual image, we are obviously bringing it on to the 'screen' (i.e., the retina) of our eye. Is there a contradiction?
✓

Answer

No
A virtual image is formed when light rays diverge. The convex lens of the eye causes these divergent rays to converge at the retina. In this case, the virtual image serves as an object for the lens to produce a real image.

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 "2 Marks Questions" from Ray Optics and Optical Instruments→Ray Optics and Optical Instruments — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Do two positively charged balls attract each other?
→
Two towers on top of two hills are $40 \ km$ apart. The line joining them passes $50 m$ above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects?
→
What is the resistance of an intrinsic semiconductor at 0K?
→
The net charge in a current-carrying wire is zero. Then, why does a magnetic field exert a force on it?
→
Using the curve for the binding energy per nucleon as a function of mass number A, state clearly how the release in energy in the processes of nuclear fission and nuclea fusion can be explained.
→
Draw a graph from the following data. Draw tangents at $x = 2, 4, 6$ and $8.$ Find the slopes of these tangents. Verify that the curve drawn is $y = 2x^2$ and the slope of dy tangent is $\tan\theta=\frac{\text{dy}}{\text{dx}}=4\text{x}.$
$x$ $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$ $9$ $10$
$y$ $2$ $8$ $18$ $32$ $50$ $72$ $98$ $128$ $162$ $200$
→
The potential difference between the terminals of a 6.0V battery is 7.2V when it is being charged by a current of 2.0A. What is the internal resistance of the battery?
→
If work function of the metal is $3.31 \times 1.6 \times$ $10^{-19}$ Joule, then calculate its threshold frequency in hertz.
→
Answer the following questions:
  1. Draw a graph showing variation of photocurrent with anode potential for a particular intensity of incident radiation. Mark saturation current and stopping potential.
  2. By how much would be stopping potential for a given photosensitive surface go up if the frequency of the incident radiations were to be increased from $4 \times 10^{15}\ Hz$ to $8 \times 10^{15}\ Hz$?
→
What is the importance of radial magnetic field in a moving coil galvanometer ?
→