Start learning →

Indian Navy 10+2 B.Tech Cadet Light - Reflection and Refraction — practice questions

Explore 4 free Light - Reflection and Refraction questions in Indian Navy 10+2 B.Tech Cadet Science. Open each question or exercise to read its content, reference answers and available explanation.

Practise Light - Reflection and Refraction with Quill →

Light - Reflection and Refraction questions and exercises with answers

Showing questions 1–4 of 4.

The image formed by a plane mirror is:Read the answer and worked solution →A concave mirror has a radius of curvature of 20 cm. Its focal length is:Read the answer and worked solution →A ray of light travels from air into a glass slab. Which of the following changes is correct?Read the answer and worked solution →A diverging lens is also called:Read the answer and worked solution →

Worked practice questions

The image formed by a plane mirror is:

  1. virtual, erect and of the same size as the object
  2. real and magnified
  3. real and inverted
  4. virtual and diminished
Show answer and solution

Correct answer: A. virtual, erect and of the same size as the object

A plane mirror gives a virtual, erect, same-size, laterally inverted image.

Open this question →

A concave mirror has a radius of curvature of 20 cm. Its focal length is:

  1. 10 cm
  2. 20 cm
  3. 40 cm
  4. 5 cm
Show answer and solution

Correct answer: A. 10 cm

1. Use R = 2f, so f = R/2. 2. Substitute R = 20 cm to get f = 10 cm. 3. The principal focus is 10 cm in front of the pole. _Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.2_

Open this question →

A ray of light travels from air into a glass slab. Which of the following changes is correct?

  1. Speed and wavelength both decrease
  2. Speed decreases, frequency decreases
  3. Wavelength increases, speed increases
  4. Frequency increases, speed decreases
Show answer and solution

Correct answer: A. Speed and wavelength both decrease

1. When light enters a denser medium, its speed decreases. 2. Frequency stays the same; wavelength shortens (v = fλ). 3. Hence both speed and wavelength decrease together. _Source: syllabus Science, Ch 9 "Light Reflection and Refraction", §9.3.1_

Open this question →

How to practise

  1. Choose a Light - Reflection and Refraction question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Science topics

Chemical Reactions and EquationsMetals and Non-metalsAcids, Bases and SaltsAcids Bases SaltsElectricityThe Human Eye and the Colourful WorldCarbon and its CompoundsC10magneticeffects