light reflection and refraction activities 10. 7 , 10.8 aim observations and conclusions
Answers
activities based on NCERT IX and X science textbooks. Moreover, ... ACTIVITY 10.8.1 ... How can refraction of light through a ... to 7 several times and conclude from your observations.
Answer:
Activity 10.1 asks us to observe the image on a large spoon.
Observation:
The image at the concave side of the spoon is real, inverted and diminished. When we move away from the spoon it also becomes smaller.
The image at the convex side of the spoon is virtual, erect and diminished. When we move away from the spoon rate of reduction in size is more.
Explanation:
A spoon acts as a concave mirror from its front side, and as a convex mirror from the back side. When we look at a spoon our distance from the spoon is around 1 foot which is more than the focal length of the spoon. Here the image is smaller.
Concave side:
The image is real and diminished.
image formation on concave side of spoon
Convex side:
The image is virtual and diminished.
image formation on convex side of spoon
Use: Concave mirror form concentrated real image when an object is at infinity. We can use this property to start a fire.
Next: How a concave mirror can start a fire. activity 10.2.