Welcome to the NCERT Solutions for Class 10 Science - Chapter Light - Reflection and Refraction. This page offers a step-by-step solution to the specific question from Exercise 5, Question 10: . With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Converging lens is convex lens
Object distance, u = −25 cm
Object height, ho = 5 cm
Focal length of convex lens, f = +10 cm
According to the lens formula,
The value of v positive this shows that the image formed at the other side of the lens.
The negative sign shows that the image is real and formed behind the lens.
The negative value of image height shows that the image formed is inverted. Ray diagram showing The position, size, and nature of image are:
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Table 10.3 Absolute refractive index of some material media
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Read MoreWelcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 5 , Question 10: An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the r....
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