Select Chapter Topics:

1. | \(10~\text{cm}\) | 2. | \(15~\text{cm}\) |

3. | \(20~\text{cm}\) | 4. | \(30~\text{cm}\) |

Subtopic: Reflection at Spherical Surface |

61%

From NCERT

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If the focal length of the objective lens is increased, then magnifying power of:

1. | microscope will increase but that of telescope decrease |

2. | microscope and telescope both will increase |

3. | microscope and telescope both will decrease |

4. | microscope will decrease but that of the telescope will increase |

Subtopic: Simple & Compound Microscope |

67%

From NCERT

AIPMT - 2014

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An air bubble in a glass slab with refractive index \(1.5\) (near-normal incidence) is \(5\) cm deep when viewed from one surface and \(3\) cm deep when viewed from the opposite face. The thickness (in cm) of the slab is:

1. | \(8\) | 2. | \(10\) |

3. | \(12\) | 4. | \(16\) |

Subtopic: Refraction at Plane Surface |

74%

From NCERT

NEET - 2016

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The correct mirror image of the figure is:

1. | 2. | ||

3. | 4. |

Subtopic: Reflection at Plane Surface |

78%

From NCERT

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A mark on the surface of the sphere \(\left(\mu= \frac{3}{2}\right)\) is viewed from a diametrically opposite position. It appears to be at a distance \(15~\text{cm}\) from its actual position. The radius of the sphere is:

1. \(15~\text{cm}\)

2. \(5~\text{cm}\)

3. \(7.5~\text{cm}\)

4. \(2.5~\text{cm}\)

Subtopic: Refraction at Curved Surface |

53%

From NCERT

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A concave lens of focal length \(25~\text{cm}\) produces an image \(\frac{1}{10}\text{th}\)$$ of the size of the object. The distance of the object from the lens is:

1. | \(225~\text{cm}\) | 2. | \(250~\text{cm}\) |

3. | \(150~\text{cm}\) | 4. | \(175~\text{cm}\) |

Subtopic: Lenses |

81%

From NCERT

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The focal lengths of the objective and eyepiece of a compound microscope are \(2\text{cm}\) and \(6.25\text{cm}\) respectively. An object \(AB\) is placed at a distance of \(2.5\text{cm}\) from the objective which forms the image \(A'B'\) as shown in the figure. The maximum magnifying power in this case, will be:

1. | \(10\) | 2. | \(20\) |

3. | \(5\) | 4. | \(25\) |

Subtopic: Simple & Compound Microscope |

68%

From NCERT

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If the space between two convex lenses of glass in the combination shown in the figure below is filled with water, then:

1. | the focal length of the system will decrease. |

2. | the focal length of the system will increase. |

3. | the power of the system will increase. |

4. | the power of the system will become infinite. |

Subtopic: Lenses |

63%

From NCERT

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In the diagram shown below, the image of the point object \(O\) is formed at \(l\) by the convex lens of focal length \(20~\text{cm},\) where \(F_1\) and \(F_2\) are foci of the lens. The value of \(x'\) is:

1. | \(10~\text{cm}\) | 2. | \(20~\text{cm}\) |

3. | \(30~\text{cm}\) | 4. | \(40~\text{cm}\) |

Subtopic: Lenses |

71%

From NCERT

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In the following diagram, what is the distance \(x\) if the radius of curvature is \(R= 15\text{cm}?\)

1. | \(30\text{cm}\) | 2. | \(20\text{cm}\) |

3. | \(15\text{cm}\) | 4. | \(10\text{cm}\) |

Subtopic: Refraction at Curved Surface |

78%

From NCERT

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