Download App

Light – Reflection and Refraction — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceLight – Reflection and Refraction1 Mark
MCQ
According to New Cartesian Sign Convention:
  • A
    Focal length of concave mirror is positive and that of convex mirror is negative.
  • B
    Focal length of both concave and convex mirrors is positive.
  • C
    Focal length of both concave and convex mirrors is negative.
  • D
    Focal length of concave mirror is negative and that of convex mirror is positive.
✓

Answer

  1. The focal length of a concave mirror is negative and that of a convex mirror is positive.

Explanation:

This is because the focus of a concave mirror is in front of the mirror, on the left side, and the focus of a convex mirror is behind the mirror, on the right side.

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-[Phy-1M]" from Light – Reflection and Refraction→Light – Reflection and Refraction — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

The power of a concave lens is 10D and that of a convex lens is 6D. When these two lenses are placed in contact with each other, the power of their combination will be:
→
The aviation fuel which is used in the engines of jet aeroplanes is:
  1. Diesel.
  2. Kerosene.
  3. Petrol.
  4. CNG.
→
Which of the following is used as a moderator in the reactor of a nuclear power station?
  1. Liquid sodium.
  2. Boron.
  3. Graphite.
  4. Carbon dioxide.
→
Which of the following can form a virtual image which is always smaller than the object?
→
An object is placed at a distance of 20cm in front of concave mirror of focal length 10cm. The image produced is:
→
A student says that the resistance of two wires of same length and same area of cross section is same. This statement is correct if
→
The unit of electrical resistance is:
  1. Ampere.
  2. Volt.
  3. Coulomb.
  4. Ohm.
→
One end of a wire carrying current in the downward direction is placed in a trough containing mercury (so that the direction of force experienced by it is clearly visible). Two pole pieces N and S are placed on each side as shown in the diagram (so as to provide uniform magnetic field).
Image
What is the direction of force experienced by the wire?
→
A light ray enters from medium A to medium B as shown in Figure. The refractive index of medium B relative to A will be:
→
Assertion : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of the current in the wire is increased.
Reason : The strength of a magnetic field at a point near the conductor increases on increasing the current.
→