Light And Optics - SS1 Physics Past Questions and Answers - page 4
Which component of a telescope is responsible for magnifying the image?
Objective lens
Eyepiece lens
Focal point
Collimator
Which type of microscope uses a beam of electrons to visualize specimens?
Light microscope
Electron microscope
Scanning probe microscope
Confocal microscope
Which optical instrument uses a combination of lenses to provide a three-dimensional view of an object?
Stereoscope
Fluorescence microscope
Polarising microscope
Scanning electron microscope
Explain the working principle of a compound microscope.
A compound microscope works on the principle of the combination of lenses to magnify small objects. It consists of two main lenses: the objective lens and the eyepiece lens. The objective lens, which is closer to the specimen, forms a magnified and inverted image of the object.
This image is then further magnified by the eyepiece lens, which is positioned close to the eye of the viewer. The final image is virtual, upright, and highly magnified. The compound microscope uses a light source, typically located at the base, to illuminate the specimen, and the lenses in the microscope system work together to focus the light and form a magnified image.
Discuss the differences between a refracting telescope and a reflecting telescope.
A refracting telescope and a reflecting telescope are two types of telescopes used to observe distant celestial objects.
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Refracting Telescope: A refracting telescope uses a combination of lenses to gather and focus light. It has an objective lens at the front that collects light and forms an image, which is then magnified by the eyepiece lens.
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Reflecting Telescope: A reflecting telescope, uses a combination of mirrors to gather and focus light. It has a concave primary mirror that collects and reflects light to form an image. This image is then magnified by an eyepiece or secondary mirror.
Which optical device is commonly used in corrective eyewear to correct vision problems?
Microscope
Telescope
Camera
Glasses
Which optical instrument is used to examine the internal structure of the human body in medical imaging?
Microscope
Telescope
Endoscope
Spectroscope
How does a magnifying glass work?
By reflecting light
By refracting light
By diffracting light
By absorbing light
Which optical device uses a combination of lenses to capture and record visual images?
Microscope
Telescope
Camera
Binoculars
What optical phenomenon allows us to see our reflection in a mirror?
Reflection
Refraction
Diffraction
Polarization