MEDIUM
10th CBSE
IMPORTANT
Earn 100

A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure below.

What is the device X?

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Important Questions on Light - Reflection and Refraction

MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 7

A student determines the focal length of a device X, by focussing the image of a far off object on the screen positioned as shown in the figure below.

What is the focal length of the device X?

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MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 8
Draw a diagram to find the focal length of a concave mirror by using distant object also write down the formula used.
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 9
Rays from Sun converge at a point 10 cm in front of a concave mirror. Where should an object be placed so that size of its image is equal to the size of the object?
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 10
A student has obtained an image of a well-illuminated distant object on a screen to determine the focal length, F1 of the given spherical mirror. The teacher then gave him another mirror of focal length, F2 and asked him to obtain a focused image of the same object on the same screen. The student found that in order to focus the same object using the second mirror, he has to move the mirror away from the screen. What result may be concluded from this observation?
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 11

Three students measured the focal length of a convex lens using parallel rays from a distant object. All of them measured the distance between lens and the inverted image of the screen. Student A saw a sharp image on the screen and labelled the distance as f1.

Student B saw a slightly larger blurred image on the screen and labelled the distance as f2.

Student B saw a slightly smaller blurred image on the screen and labelled the distance as f3.

What relation most likely would be between the three measurements?

MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 12
A student obtained a sharp image of the grill of a window on a screen, using convex lens. For getting better results, the teacher suggested focusing of a distant tree instead of the grill. In which direction should the lens be moved for this purpose? 
 
MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 13

Parallel rays from a distant tree incident on a device 'X', form its distinct image on a screen as shown. What is the device 'X' and which of the following diagrams correctly shows the image of the tree on the screen? 

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MEDIUM
10th CBSE
IMPORTANT
Science Part-I NEW ERA PHYSICS Textbook for Class X>Chapter 4 - Light - Reflection and Refraction>PRACTICAL SKILLS BASED QUESTIONS>Q 14

What precautions should be taken for the experiment to determine the focal length of convex lens by obtaining image of a distant object.