Light And Optics - SS1 Physics Past Questions and Answers - page 5
Which optical device uses a lens or mirror to gather and focus light from distant objects?
Microscope
Telescope
Camera
Projector
Which optical device is commonly used in laser pointers and barcode scanners?
Microscope
Telescope
Laser diode
Fiber optic cable
Explain the principles behind microscopy.
Microscopy is an important application of optics in medicine. Optical microscopes use lenses and illumination sources to magnify and resolve microscopic objects. Techniques such as brightfield microscopy, fluorescence microscopy, and confocal microscopy allow researchers and medical professionals to observe cells, tissues, and microorganisms with high resolution.
Describe the application of optics in photography and imaging devices. Discuss the role of lenses and image formation principles.
Optics is fundamental to photography and imaging devices. Lenses are the key components that focus light and form images. In cameras, lenses gather and converge light onto the image sensor or film, creating a focused image. The properties of lenses, such as focal length and aperture, determine aspects like depth of field and magnification.