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Champ Jee
Subject: Science
, asked on 23/2/18
A plane mirror is approaching you at 10cm/s. Your image shall approach you at speed of:...
Please explain also. Thanks!
(I didnt understand the links! Please explain with a diagram and everythig clearly.... Please. Thanks)
Also tell why is this incorrect? In the pic?
Answer
3
Champ Jee
Subject: Science
, asked on 23/2/18
Please clear this conceptual doubt!!
Answer
1
Champ Jee
Subject: Science
, asked on 23/2/18
Q10. No links! Show calci!
Q.10. A spherical mirror is to be used to form an image five times the size of an object on a screen located 5 m from the object. (a) Describe the type of mirror required. (b) Where should the mirror be positioned relative to the object?
(Ans. 2.08 m, concave)
Answer
2
Champ Jee
Subject: Science
, asked on 23/2/18
Q8. No links! Show calci! Thanks!
Q.8. A candle is 49 cm in front of a convex spherical mirror, of radius of curvature 70 cm. (a) Where is the image? (b) What is the magnification?
Answer
1
Atreya
Subject: Science
, asked on 23/2/18
7th.one please
Answer
2
Champ Jee
Subject: Science
, asked on 22/2/18
Which lens has a virtual focus? I didnt understand the question. Please explian.
Answer
1
Payal Arora
Subject: Science
, asked on 22/2/18
Which set of observations is incorrect and why ?:
Distance of flame
from the lens (cm)
Distance of the screen
From the Lens (cm)
(i) 60
20
(ii) 40
24
(iii) 30
30
(iv) 24
40
(v) 15
70
Answer
1
Shayan Aatif
Subject: Science
, asked on 22/2/18
If an object is placed at 30 cm from a convex lens of focal length 20 cm. On the other side a convex mirror of placed having radius of curvature 10 cm. Find the distance of the convex mirror from the convex lens if the image formed is virtual and erect on the same place where object is placed.
Answer
3
Payal Arora
Subject: Science
, asked on 22/2/18
👇🏻
Q. Observe the following incomplete ray diagram for a convex lens:
Draw the rays I, II and III after refraction and also locate the optical centre of the lens in ray diagram.
Answer
2
Champ Jee
Subject: Science
, asked on 22/2/18
) The refractive index oi ethyl alchohal carbon disulfide and water are 1 _ 36. 1.63 and _ 33 respective*. tn which medium wit' Eight travel the fastest? (Speed of light in air = 3 rn;s} Answer Speed of fight in air Refractive index Of ethyl alcohol Speed light in alcohol Spccd 01' light in ethyl alcohol Hence. speed of light in alcohol =
Answer
1
Smaran
Subject: Science
, asked on 22/2/18
draw a diagram to trace the path of ray of light incident at an angle 40 degree on a rectangular glass slab and also find the angle of refraction
Answer
1
Champ Jee
Subject: Science
, asked on 21/2/18
The following data was recorded for values of object distance and the corresponding values of image distance in the experiment on study of real image formation by a convex lens of power +5 D, One of these observations is incorrect. Identify this observation and give reason for your choice :
S. No.
1
2
3
4
5
6
Object distance (in cm)
25
30
35
45
50
55
Image distance (in cm)
97
61
37
35
32
30
Answer
2
Raghav Singh
Subject: Science
, asked on 21/2/18
Please answer question 6.
6.
When a lens is cut in two equal halves
(i) along the principal axis
(ii) perpendicular to principal axis. What will be the focal length of each half?
Answer
1
Raghav Singh
Subject: Science
, asked on 21/2/18
Please tell why are we subtracting Sn and Sn-1 over here? Is it a formula or for proving the statement.And how we get Sn-1?
Answer
1
Raghav Singh
Subject: Science
, asked on 21/2/18
Please explainn the second point of question 3. What is critical angle ......?
Answer
2
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What are you looking for?

Please explain also. Thanks!

(I didnt understand the links! Please explain with a diagram and everythig clearly.... Please. Thanks)

Also tell why is this incorrect? In the pic?

Q.10. A spherical mirror is to be used to form an image five times the size of an object on a screen located 5 m from the object. (a) Describe the type of mirror required. (b) Where should the mirror be positioned relative to the object?

(Ans. 2.08 m, concave)

Q.8. A candle is 49 cm in front of a convex spherical mirror, of radius of curvature 70 cm. (a) Where is the image? (b) What is the magnification?

from the lens (cm)

From the Lens (cm)

Q. Observe the following incomplete ray diagram for a convex lens:

Draw the rays I, II and III after refraction and also locate the optical centre of the lens in ray diagram.

6.When a lens is cut in two equal halves(i) along the principal axis

(ii) perpendicular to principal axis. What will be the focal length of each half?