Download App

Human Eye and Colourful World — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHuman Eye and Colourful World3 Marks
MCQ
How are we able to see nearby and also the distant objects clearly?
  • ✓
    Human eyes have power of accommodation. When we have to see distant objects, the eye muscles relax and lens becomes thin. Due to this, the focal length of the lens increases and the eye is able to see distant objects. When we have to see nearby objects, the eye muscles contract and lens becomes thick. Due to this, the focal length of the lens decreases and the eye is able to see nearby objects.
✓

Answer

Correct option: A.
Human eyes have power of accommodation. When we have to see distant objects, the eye muscles relax and lens becomes thin. Due to this, the focal length of the lens increases and the eye is able to see distant objects. When we have to see nearby objects, the eye muscles contract and lens becomes thick. Due to this, the focal length of the lens decreases and the eye is able to see nearby objects.
Human eyes have power of accommodation. When we have to see distant objects, the eye muscles relax and lens becomes thin. Due to this, the focal length of the lens increases and the eye is able to see distant objects. When we have to see nearby objects, the eye muscles contract and lens becomes thick. Due to this, the focal length of the lens decreases and the eye is able to see nearby objects.

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 "Answer the questions.[Phy-3M]" from Human Eye and Colourful World→Human Eye and Colourful World — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Find the position and size of the virtual image formed when an object 2cm tall is placed 20cm from:
  1. A diverging lens of focal length 40cm.
  2. A converging lens of focal length 40cm.
→
Give two circumstances in which a concave mirror can form a magnified image of an object placed in
front of it. Illustrate your answer by drawing labelled ray diagrams for both.
→
What is, highest, and lowest, resistance which can be obtained by combining Com resistors having the following resistances?

$4 Ω, 8 Ω, 12 Ω, 24 Ω$

→
An old man cannot see objects closer than 1m from the eye clearly. Name the defect of vision he is suffering from. How can it be corrected? Draw ray diagram for the,
  1. Defect of vision.
  2. For its correction.
→
Giving reasons, state the ‘signs’ (positive or negative) which can be given to the following:
  1. Object distance (u) for a concave mirror or convex mirror.
  2. Image distances (v) for a concave mirror.
  3. Image distances (v) for a convex mirror.
→
If a potential difference of 10V causes a current of 2A to flow for 1 minute, how much energy is transferred?
→
Describe with the help of a ray-diagram, the formation of image of a finite object placed in front of a convex lens between f and 2f Give two characteristics of the image so formed.
→
You have four resistors of $8\Omega.$ each. Show how would you connect these resistors to have effective resistance of $8\Omega.$
→
A man sits in an optician's chair looking into plane mirror which is 2m away from him and views the image of a chart which faces the mirror and is 50cm behind his head. How far away from his eyes does the chart appear to be?
→
Why, we do not use series combination of connecting electric appliances in household circuit?
→