Which one of the following ore minerals show internal reflection ?
Orpiment
Orpiment option is correct.
Internal reflection in reflected-light ore microscopy is the coloured light returned from within a grain when the mineral is partly transparent to visible light. It is characteristic of ore minerals with relatively low reflectance and non-metallic to sub-metallic character, and it is diagnostic in identification.
Orpiment (As2S3) is a soft, sub-translucent arsenic sulphide that shows strong yellow internal reflections between crossed nicols — a classic textbook example along with cinnabar, sphalerite, proustite and cassiterite. Magnetite, pyrite and molybdenite are all opaque, high-reflectance metallic ore minerals that show no internal reflection at all under any orientation. Only orpiment fits the property asked for.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
