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Indian Navy SSR (Sailor) The Human Eye and the Colourful World — practice questions

Explore 1 free The Human Eye and the Colourful World questions in Indian Navy SSR (Sailor) Science. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

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A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:Read the answer and worked solution →

Worked practice questions

A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:

  1. +30 cm, erect
  2. +60 cm, virtual
  3. -15 cm, inverted (option)
  4. -60 cm, inverted, real
Show answer and solution

Correct answer: D. -60 cm, inverted, real

1. Apply 1/v + 1/u = 1/f with u = -30, f = -20. 2. 1/v = -1/20 + 1/30 = -3/60 + 2/60 = -1/60, so v = -60 cm. 3. Image is 60 cm in front (real), inverted (because v and u have same sign). _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.1_

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