Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

What is real depth and apparant depth and deravation
Asked by parjapati16062003 | 10 Jan, 2022, 10:12: AM
answered-by-expert Expert Answer
Let us consider an object at O inside water as shown in figure. OC is incident ray that is getting refracted at water-air interface
so that refracted ray deflected away from normal as shown in figure. If a person seeing the object through refracted ray , then
the object will appear at A to him as shwn in figure.
 
Angle of incidence i and angle of refraction are marked and are shown in figure.
 
By law of refraction , 
 
begin mathsize 14px style fraction numerator sin left parenthesis i right parenthesis over denominator sin left parenthesis r right parenthesis end fraction space equals space 1 over mu end style
where μ is refractive index of water with respect to air
 
If angles i and r are small , then sine of angles are approximately equal to tangent of angles
 
begin mathsize 14px style fraction numerator sin left parenthesis i right parenthesis over denominator sin left parenthesis r right parenthesis end fraction space equals space fraction numerator tan left parenthesis i right parenthesis over denominator tan left parenthesis r right parenthesis end fraction space equals space fraction numerator B C divided by O B over denominator B C divided by O A end fraction space equals space fraction numerator O A over denominator O B end fraction space equals space 1 over mu end style
Since OA is real depth and OB is apparent depth , then we have
 
begin mathsize 14px style fraction numerator R e a l space d e p t h over denominator A p p a r e n t space d e p t h end fraction space equals space mu end style
Answered by Thiyagarajan K | 10 Jan, 2022, 02:25: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
explain relative refractive index??
Asked by zahirqk | 08 Jan, 2023, 09:50: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is real depth and apparant depth and deravation
Asked by parjapati16062003 | 10 Jan, 2022, 10:12: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
when snell's law is not valid? or for what angle of incidence snell's law is not valid?
Asked by satwarsuraj | 10 May, 2020, 06:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
In an aquarium a fish 6 cm long is swimming directly towards the plane glass front . If at a certain moment head of the fish is 18 cm behind the glass front,find the apparent length of the fish as seen by a person looking through the glass.  Given R.I. of water = 4/3
Asked by mridulabarua05 | 02 Feb, 2019, 11:28: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
When a white ray of light passes through a prism , it is dispersed. Why? Why does violet colour deviates most, but red colour deviates least while dispersed by a prism?
Asked by pradeepjsme | 01 Feb, 2019, 02:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
draw the path of a ray passing through a glass slab. state the factors on which lateral displacement depend. what is the angle of deviation of emergent ray
Asked by kalyani | 19 Sep, 2018, 04:28: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is refraction? State the three laws of refraction.
Asked by Topperlearning User | 20 May, 2014, 03:06: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is the basic cause for refraction?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Why does a tank appear shallower than its actual depth?
Asked by Topperlearning User | 20 May, 2014, 03:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Prove that apparent depth is ¾ of real depth.
Asked by Topperlearning User | 20 May, 2014, 03:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×